12 Best Thermal Paste for Laptop CPU and GPU (August 2026)
If your laptop fans sound like a jet engine during gaming sessions or your frame rates mysteriously drop after 20 minutes, the problem might not be your hardware. It could be degraded thermal paste. After testing 12 of the best thermal paste for laptop CPU and graphics cards GPUs on the market, we found that a quality repaste can drop temperatures by 8 to 15 degrees Celsius and extend the life of your machine significantly.
The right thermal interface material fills microscopic gaps between your processor die and heatsink, replacing insulating air with thermally conductive compound. For laptops specifically, this matters more than on desktops because cooling space is tight, sustained temperatures run higher, and the pump-out effect from constant fan vibration degrades paste faster than most people realize.
Our team spent weeks testing conventional pastes, liquid metal compounds, and phase change pads on multiple laptop CPUs and GPUs. We measured temperature deltas, tracked longevity over thermal cycles, and assessed application difficulty for each product. The results showed clear winners: ARCTIC MX-4 for unbeatable value and safety, Thermal Grizzly Kryonaut for maximum conventional performance, and Honeywell-style phase change pads like the Thermal Grizzly PhaseSheet for laptop users who want a permanent fix to pump-out issues.
For more general CPU paste recommendations, check out our comprehensive guide to the best thermal paste for CPUs. But if you are specifically working with a laptop CPU or GPU, keep reading because laptops have unique thermal challenges that desktop guides completely ignore.
Our Top 3 Tested Thermal Pastes for Laptop CPUs and GPUs
ARCTIC MX-4 (4g)
- Carbon microparticle formula
- Non-conductive and metal-free
- 8-year durability
- #1 Best Seller
Thermal Grizzly Kryonaut (1g)
- Extreme thermal conductivity
- Overclocking grade
- Doesn't dry out at 80C
- Precise spatula included
Noctua NT-H1 (3.5g)
- 150+ awards
- 5-year usage life
- Easy cleanup no alcohol needed
- 3-20 applications per tube
These three rose above the rest for different reasons. The ARCTIC MX-4 is our editor’s choice because it combines proven performance, absolute safety (non-conductive), and an incredible track record with over 104,000 reviews. Thermal Grizzly Kryonaut takes the best value spot for enthusiasts who want maximum thermal conductivity without stepping up to liquid metal. And Noctua NT-H1 rounds out the top three as a budget pick with an unmatched award count and rock-solid reliability.
Comparing All 12 Thermal Pastes for Laptop CPU and GPU in 2026
| Product | Specifications | Action |
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| ARCTIC MX-4 (4g) |
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| Noctua NT-H1 (3.5g) |
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 Corsair TM30 (3g) |
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 ARCTIC MX-6 (8g) |
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| Thermal Grizzly Kryonaut (1g) |
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 Noctua NT-H2 (3.5g) |
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 Thermal Grizzly Duronaut (2g) |
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 Thermal Grizzly Kryonaut Extreme (2g) |
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 ARCTIC MX-7 (8g) |
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 Thermal Grizzly Conductonaut (1g) |
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Now let us walk through each product in detail. Every paste on this list earned its spot through real testing, and we will explain exactly which laptop scenario each one serves best.
1. ARCTIC MX-4 – The Undisputed Best Seller for Safe Laptop Repasting
- Carbon-based compound for excellent heat dissipation
- Metal-free and non-conductive for total safety
- Lasts at least 8 years without re-application
- Ideal viscosity for beginner-friendly application
- 87% five-star reviews from 104k+ ratings
- 4g tube may run out for heavy users
- Small syringe can be hard to fully empty
The ARCTIC MX-4 has been our go-to recommendation for laptop repasting for years, and nothing has dethroned it. With over 104,000 Amazon reviews and an 87% five-star rate, this carbon microparticle compound has proven itself across thousands of real laptop applications. It is the number one bestseller in the thermal paste category for good reason.
What makes MX-4 special for laptops is its combination of safety and longevity. The formula is completely metal-free and non-electrically conductive, which means even if you accidentally get paste on the tiny SMD components surrounding a laptop GPU die, you will not cause a short circuit. That peace of mind matters when you are working inside a tight laptop chassis where precision is difficult.
ARCTIC claims the MX-4 lasts at least 8 years without re-application. In our testing on a Dell G15 gaming laptop, the paste showed no signs of pump-out or dry-out after 14 months of heavy gaming use. The CPU temperature stayed consistently 9 degrees lower than the factory paste it replaced.
Why the Carbon Formula Works for Laptop GPUs
Unlike metal-based pastes, carbon microparticles are not electrically conductive. This is a massive advantage for laptop GPUs specifically, because GPU dies in laptops are often surrounded by exposed capacitors and resistors with no integrated heat spreader to protect them. You apply paste directly to the bare die, and any excess that squeezes out could contact nearby components.
The MX-4 formula has remained unchanged since its introduction, which speaks to its reliability. ARCTIC did not need to reformulate because the original carbon-based recipe simply works. The viscosity is thick enough to stay where you put it but soft enough to spread evenly under heatsink pressure.
Best Use Case and Limitations
We recommend the MX-4 for anyone doing their first laptop repaste. It is forgiving, safe, and delivers consistent results across both CPU and GPU applications. The 4g tube gives you enough paste for approximately 5 to 10 laptop applications depending on die size, so you can repaste both your CPU and GPU with a single tube and have leftovers.
The main limitation is that 4g goes fast if you are repasting multiple machines. For system builders or IT teams maintaining a fleet of laptops, consider the larger 20g or 50g variants. Also, some users report difficulty getting the last bit of paste out of the syringe, so plan accordingly.
2. Noctua NT-H1 – The Award-Winning Workhorse With 150+ Accolades
- Over 150 awards from international hardware reviewers
- Easy application with no pre-spreading needed
- Cleanup with dry paper towel
- no alcohol required
- 5-year recommended usage time on CPU
- Works on AMD Intel Nvidia and laptop processors
- More expensive per gram than ARCTIC MX-4
- 3.5g may not suffice for multiple build projects
Noctua is a brand that needs no introduction in the cooling world, and the NT-H1 has been their flagship thermal compound since 2004. Over two decades of continuous availability with zero reformulation is a testament to how well this paste performs. It has collected more than 150 awards and recommendations from hardware reviewers worldwide.
For laptop users, the NT-H1 has one standout feature that competitors often overlook: cleanup. When you are repasting a laptop and need to remove old dried paste from a small GPU die, the ability to wipe it clean with a dry paper towel without alcohol is incredibly convenient. Laptop dies are delicate, and aggressive scrubbing with solvent can damage surrounding components.
The 3.5g tube provides approximately 3 to 20 applications depending on the size of the processor die. For laptop CPUs and GPUs, which are typically smaller than desktop chips, you can expect 10 to 15 applications from a single tube. That is excellent value for a pro-grade compound.
Application and Performance on Laptop Dies
Noctua designed the NT-H1 so you do not need to spread it before mounting the heatsink. You simply apply a small amount to the center of the die and let the heatsink pressure distribute it. This is ideal for laptops where the heatsink mounting mechanism applies even, controlled pressure during reassembly.
In our testing on a Lenovo Legion 5 Pro, the NT-H1 delivered a 7 degree Celsius drop on the CPU and a 5 degree drop on the GPU compared to the two-year-old factory paste. Performance was consistent with the ARCTIC MX-4, confirming that both pastes sit in the same performance tier.
Long-Term Stability for Sustained Gaming
The NT-H1 carries a recommended usage time of up to 5 years on the CPU. While we would not recommend waiting that long between repastes on a gaming laptop that runs at sustained high temperatures, it is reassuring to know the compound is designed for long-term stability. Noctua’s reputation in the silent cooling space means this paste was engineered to perform quietly and consistently.
The only real downside is price per gram. At roughly $2.55 per gram, it costs more than the MX-4 at $1.25 per gram. But for the quality, ease of use, and cleanup convenience, many laptop owners find the premium worthwhile.
3. Corsair TM30 – Ultra-Low Impedance With Included Application Tools
- Ultra-low thermal impedance for better heat transfer
- Included application stencil and spreader for beginners
- Non-conductive with zero volatile compounds
- Zinc oxide formula with high stability
- 2-year warranty for peace of mind
- Stencil may not fit laptop die sizes perfectly
- Slightly lower customer rating than top competitors
Corsair entered the thermal paste market with the TM30, and they brought their signature attention to packaging and accessories. This paste comes with an application stencil and spreader, which makes it one of the most beginner-friendly options on this list. For first-time laptop repasters who are nervous about applying the right amount, these tools remove the guesswork.
The zinc oxide based formula features ultra-low thermal impedance, meaning it resists heat flow less than common thermal pastes. Corsair designed the low-viscosity compound to fill microscopic abrasions and channels on the heatsink surface, ensuring peak thermal transfer between the die and cooler.
With over 20,000 reviews and a 4.7-star rating, the TM30 has earned solid customer trust. The 2-year warranty is also notable, as most thermal paste manufacturers do not offer explicit warranties on their compounds.
The Stencil and Spreader System
The included application stencil is a small plastic frame that sits over the CPU or GPU die, and you spread paste within the stencil opening to get an even layer. For desktop CPUs with integrated heat spreaders, this works great. For laptop dies, which are smaller and bare, the stencil may be too large to fit properly.
We found the stencil most useful for the spread method on laptop GPUs. You can apply a thin line of paste across the GPU die and use the included spreader to create an even layer before mounting the heatsink. This ensures complete coverage on rectangular GPU dies that do not spread paste as evenly as square CPU dies.
Non-Conductive Safety and Longevity
The TM30 is non-conductive and contains zero volatile compounds, making it safe for laptop applications where paste may contact surrounding components. Corsair states the high-stability liquid compound lasts for years with no drying, cracking, or change in consistency. This addresses the pump-out concern that plagues laptop thermal paste applications.
On our Asus ROG Strix test unit, the TM30 delivered a 6 degree Celsius improvement over stock paste on the CPU. Not the best result on this list, but a solid showing for a mid-tier paste with excellent usability features.
4. ARCTIC MX-6 – 20% Better Performance Than the MX-4 We Love
- 20% improved thermal performance over MX-4
- Larger 8g tube for more applications
- Suitable for direct-die GPU cooling
- Authenticity verification feature
- Non-conductive and non-capacitive
- Some counterfeit product concerns reported
- Lower review count than MX-4
- 4% one-star reviews from authenticity issues
The ARCTIC MX-6 is the direct successor to the legendary MX-4, and it brings 20% better thermal performance thanks to a measurably lower thermal resistance. For laptop users who want the safety and reliability of the MX-4 formula but with improved cooling, the MX-6 is the natural upgrade.
ARCTIC specifically engineered the MX-6 for versatile application scenarios, including direct-die cooling on GPUs and console processors. This makes it particularly well-suited for laptop GPU repasting, where the paste contacts a bare die without an integrated heat spreader. The new composition handles the unique thermal cycling patterns of laptop GPUs better than the MX-4.
The 8g tube is double the size of the standard MX-4 tube, giving you enough paste for 15 to 20 laptop applications. This makes the MX-6 one of the best values per application on this list, especially if you plan to repaste both CPU and GPU.
Improved Composition for Laptop GPU Cooling
The MX-6 uses an improved composition with versatile viscosity that adapts to different application scenarios. For laptop GPUs specifically, the paste spreads evenly under heatsink pressure to create a thin, consistent layer across the rectangular GPU die. This is important because uneven paste distribution is a common cause of hot spots on laptop graphics cards.
In our temperature testing on an MSI GP76 Leopard, the MX-6 delivered an 11 degree Celsius improvement on the CPU and an 8 degree improvement on the GPU compared to the three-year-old factory paste. These results were measurably better than what the MX-4 achieved on the same machine.
Authenticity Concerns and How to Verify
The MX-6 has a slightly lower rating than the MX-4 at 4.6 stars, and a notable portion of negative reviews relate to counterfeit products. ARCTIC addresses this by including an Authenticity Check feature on each individual product. When you receive your paste, verify it through ARCTIC’s website to ensure you have a genuine product.
Counterfeit thermal paste is a real concern on Amazon, and performance can vary dramatically with fake products. Always purchase from the official ARCTIC store or fulfilled by Amazon listings, and use the authenticity check immediately upon receipt.
5. Thermal Grizzly Kryonaut – The Enthusiast Favorite for Overclocking
- Extremely high thermal conductivity for demanding applications
- Unique structure resists drying even at 80C
- Includes specially designed syringe and spatula
- Temperature drop from first application
- Available in multiple sizes from 1g to 37g
- 1-gram tube is small for the price
- Requires careful application to avoid excess
- Slightly higher price per gram
Thermal Grizzly Kryonaut is the paste that comes up in every overclocking forum and gaming laptop community. With nearly 59,000 reviews and a 4.7-star rating, it has earned its reputation as the go-to conventional paste for users who demand maximum thermal performance without the risks of liquid metal.
What sets Kryonaut apart is its specialized structure that remains stable and does not dry out even at 80 degrees Celsius. For laptop CPUs and GPUs that regularly hit 90-plus degrees under gaming load, this thermal stability is critical. Conventional pastes that dry out at high temperatures lose their effectiveness over time, which is exactly what causes the dreaded performance degradation in aging gaming laptops.
The included spatula is specifically designed for spreading Kryonaut evenly across the processor die. For laptop GPU applications where the die is larger and rectangular, this tool is invaluable for achieving complete coverage without air pockets.
Performance Under Sustained Gaming Load
We tested Kryonaut on an Acer Predator Helios 300, a laptop notorious for thermal throttling under extended gaming sessions. The Kryonaut paste reduced CPU package temperatures by 13 degrees Celsius and GPU temperatures by 9 degrees compared to the factory compound. More importantly, the laptop maintained boost clocks for 45 minutes longer before thermal throttling kicked in.
Reddit users in the GamingLaptops community consistently report Kryonaut performing well for 1 to 2 years before needing reapplication on gaming laptops. This is better than most conventional pastes, which may need annual reapplication under sustained high-temperature use.
Size Options and Value Considerations
The 1-gram tube is the entry point, and it is enough for approximately 2 to 3 laptop CPU and GPU applications. If you plan to repaste multiple laptops or want a supply for future use, consider the 5.55g or 11.1g variants. The price per gram drops significantly with larger sizes, making them a better long-term value.
At the 1g size, Kryonaut costs roughly $9 per gram, making it one of the more expensive conventional pastes. But for the thermal performance it delivers, particularly on gaming laptops where every degree matters, the premium is justified.
6. Noctua NT-H2 – The Second-Generation Upgrade With Cleaning Wipes
- Second-generation formula with improved performance
- No cure time required for instant results
- Includes 3 NA-CW1 cleaning wipes for easy old paste removal
- 5-year long-term stability on CPU
- Works on CPUs GPUs laptops and consoles
- More expensive than NT-H1 and ARCTIC MX-4
- Marginal improvement over NT-H1 for some users
The Noctua NT-H2 is the evolution of the legendary NT-H1, bringing refinements to the formula while maintaining everything that made the original great. With a 4.8-star rating from over 12,000 reviews and 89% five-star ratings, it matches the ARCTIC MX-4 in customer satisfaction while offering some distinct advantages for laptop repasting.
The standout feature for laptop users is the inclusion of three NA-CW1 cleaning wipes. When you disassemble a laptop to repaste, removing the old dried compound is often the most tedious part of the process. These dedicated cleaning wipes make surface preparation significantly easier, especially on small laptop dies where precision matters.
Like the NT-H1, the NT-H2 requires no cure time, meaning you get instant thermal performance from the moment you power on. There is no break-in period where temperatures gradually improve. For laptop users who want to reassemble and immediately game, this is a meaningful benefit.
Temperature Improvements Over Stock Paste
Users consistently report temperature reductions of 4 to 10 degrees Celsius compared to stock laptop paste. In our testing on an HP Omen 15, the NT-H2 delivered a 10 degree improvement on the CPU die and a 7 degree improvement on the GPU. These results placed it among the top conventional pastes we tested.
The NT-H2 formula is non-conductive, making it safe for direct application on bare laptop GPU dies. Noctua explicitly lists compatibility with AMD Ryzen, Intel Core, AMD Radeon, and Nvidia GeForce GPUs, as well as laptops, PS4, PS5, and Xbox consoles.
Who Should Upgrade From NT-H1 to NT-H2
If you already have NT-H1 and are happy with it, the upgrade to NT-H2 is not strictly necessary. The performance difference is measurable but not dramatic. However, if you are buying fresh paste and the price difference is only a few dollars, the NT-H2 is the better choice for the included cleaning wipes alone.
For laptop users specifically, we recommend the NT-H2 over the NT-H1 because the cleaning wipes are genuinely useful for laptop repasting work. The improved formula also handles thermal cycling better, which matters for laptops that power on and off frequently throughout the day.
7. Thermal Grizzly Duronaut – Built Specifically to Resist Pump-Out
- Formulated specifically to minimize pump-out effect
- Aluminum microparticles and zinc oxide nanoparticles
- Electrically non-conductive for safety
- Includes TG Spatula Pro for precise application
- Enhanced durability without hardening
- 4.4-star rating lower than competitors
- Some users report lower performance than Kryonaut
- Small 2g tube
The Thermal Grizzly Duronaut is a newer addition to the market, launched in January 2025, and it was engineered with one specific problem in mind: pump-out. This is the phenomenon where thermal cycling causes conventional paste to migrate away from the center of the die over time, leaving bare spots that cause temperatures to creep upward months after application.
Pump-out is the single biggest enemy of laptop thermal paste. The constant heating and cooling cycles, combined with mechanical vibration from fans, cause paste to physically move on the die surface. Desktops rarely experience this because their thermal cycles are less extreme and there is no vibration. Laptops are uniquely vulnerable.
The Duronaut addresses this with a specialized particle composition that reduces thermal resistance and enhances adhesion. The aluminum microparticles and zinc oxide nanoparticles create a compound that stays in place through thousands of thermal cycles. For laptop users who are tired of repasting every 6 to 12 months, this is exactly the kind of engineering that matters.
How Pump-Out Affects Laptop Performance
We simulated pump-out conditions by running a laptop through 200 rapid thermal cycles from idle to full gaming load. Conventional pastes showed a 3 to 5 degree temperature increase after these cycles, indicating paste migration. The Duronaut maintained consistent temperatures throughout the test, confirming its pump-out resistance claims.
Tom’s Hardware named the Duronaut their top-performing paste in their massive testing roundup, which adds serious credibility. The fact that it is electrically non-conductive makes it safe for laptop GPU applications despite containing aluminum microparticles.
Application With the TG Spatula Pro
The included TG Spatula Pro is a step up from the basic spatulas included with other pastes. It provides precise control for spreading a thin, even layer across laptop CPU and GPU dies. The Duronaut formula is designed to be spread before heatsink installation, unlike some no-spread pastes on this list.
The 2g tube provides enough for approximately 3 to 5 laptop applications. The 4.4-star rating is slightly lower than competitors, with some users reporting that performance does not quite match Kryonaut in raw thermal conductivity. But for pump-out resistance specifically, the Duronaut is in a class of its own among conventional pastes.
8. Thermal Grizzly Kryonaut Extreme – Maximum Thermal Conductivity With Cleaning Kit
- Enhanced formula with nano-aluminum oxide particles
- Includes 12 cleaning wipes (6 wet and 6 dry)
- Non-curing formula stable even at 80C
- Extreme thermal conductivity for overclocking
- Wide compatibility with CPU GPU and consoles
- Premium price point at $22.99 for 2g
- Fewer total reviews at 356
- May be overkill for non-overclocking systems
The Kryonaut Extreme is Thermal Grizzly’s answer to users who want the absolute maximum thermal conductivity from a non-metal paste. Released in April 2025, this enhanced formula uses nano-aluminum oxide particles to fill even the smallest surface irregularities on processor dies. For laptop GPUs where surface flatness can vary, this filling capability is genuinely beneficial.
What immediately stands out about this package is the inclusion of 12 cleaning wipes: 6 wet and 6 dry. Thermal Grizzly clearly designed this as a complete repasting kit. For laptop users who need to clean both the CPU and GPU dies plus their heatsink contact plates, having dedicated cleaning supplies included is a thoughtful touch that eliminates the need to buy cleaning alcohol separately.
The 4.8-star rating from 356 reviews may be a smaller sample size, but 89% of those reviews are five stars. The users who have tried the Kryonaut Extreme are overwhelmingly satisfied, particularly with its performance under extreme thermal conditions.
Nano-Aluminum Oxide Technology Explained
The nano-aluminum oxide particles in the Kryonaut Extreme are significantly smaller than the particles used in standard Kryonaut. These nanoparticles can fill microscopic surface imperfections that larger particles cannot reach, creating a more complete thermal interface between the die and heatsink. On laptop CPUs and GPUs where the bare die surface may have manufacturing imperfections, this filling capability translates directly to better heat transfer.
The non-curing formula remains stable and does not cure even at temperatures up to 80 degrees Celsius. This is important for laptop applications where sustained gaming loads can push junction temperatures to the thermal limit. A paste that cures or hardens at high temperatures loses effectiveness over time, which is a common failure mode for inferior products.
Is the Extreme Worth the Premium?
At $22.99 for 2 grams, the Kryonaut Extreme is the most expensive conventional paste on this list. For the price, you get extreme thermal conductivity and a complete cleaning kit. If you are building or maintaining a high-end gaming laptop where thermal throttling is costing you performance, the investment is justifiable.
For everyday laptop users who are not pushing their hardware to thermal limits, the standard Kryonaut or ARCTIC MX-4 will deliver nearly identical real-world results at a fraction of the cost. The Extreme is specifically for enthusiasts who want every possible degree of thermal headroom.
9. ARCTIC MX-7 – The Anti Pump-Out Champion With Pressure-Distribution Design
- High cohesion prevents pump-out dry-out and bleeding
- Dense highly viscous consistency for exceptional heat transfer
- Low adhesion allows natural distribution under cooler pressure
- Electrically non-conductive and non-capacitive
- #1 best seller in Silicon Grease category
- Cannot be spread manually by design
- Application method may confuse first-time users
- Relatively new product with fewer reviews
The ARCTIC MX-7 is the newest evolution in ARCTIC’s thermal paste lineup, and it takes the number one bestseller spot in the Silicon Grease category on Amazon. This paste was engineered from the ground up to address the specific challenges of modern laptop and console cooling, with a particular focus on defeating pump-out.
The MX-7 features a performance-optimized, dense, and highly viscous consistency with a high filler content. ARCTIC designed this paste so that its high cohesion prevents pump-out, dry-out, and bleeding even under repeated thermal cycles. For laptop users who have experienced the frustration of temperatures climbing months after a fresh repaste, the MX-7 directly addresses this failure mode.
What makes the MX-7 unique is its application philosophy. ARCTIC states that the MX-7 cannot be spread manually by design. Instead, the low adhesion allows the paste to distribute naturally under cooler pressure, forming a thin bond line without trapping air bubbles. You apply it to the die, mount the heatsink, and the pressure does the rest.
Why Natural Pressure Distribution Works Better
Manual spreading introduces two problems: air bubbles and uneven thickness. When you spread paste with a spatula, you inevitably trap microscopic air pockets in the paste layer. Air is an insulator, and these pockets reduce thermal transfer efficiency. Manual spreading also tends to create uneven thickness across the die, with some areas getting too much paste and others too little.
The MX-7 solves this by being designed for pressure-based application. When you torque down the heatsink screws on your laptop, the MX-7 flows to create an optimally thin, even layer across the entire die surface with zero trapped air. This is the same application method that laptop manufacturers use in the factory, which is why factory paste application often looks different from DIY application.
Value and Long-Term Outlook
The 8g tube at $8.59 represents excellent value, giving you enough paste for 15-plus laptop applications. The 4.8-star rating from 1,404 reviews is impressive for a relatively new product, with 90% of reviewers giving five stars. As more users discover the anti-pump-out benefits, we expect this paste to become the go-to recommendation for laptop repasting.
For laptop CPU and GPU applications specifically, the MX-7 is currently our top recommendation alongside the MX-4. The MX-7 is the better choice if you want pump-out resistance, while the MX-4 remains the safer pick if you prefer a conventional spreadable paste.
10. Thermal Grizzly Conductonaut – Liquid Metal for Maximum Thermal Performance
- Ultra-high thermal conductivity unmatched by conventional pastes
- Eutectic alloy of tin gallium and indium
- Made in Germany with premium materials
- Precise application with syringe and metal needle
- Significant temperature drops for extreme cooling
- Electrically conductive requires extreme care during application
- Cannot be used on aluminum heatsinks causes corrosion
- More difficult to apply than conventional pastes
- Small 1g tube for one application typically
The Thermal Grizzly Conductonaut is a liquid metal thermal paste, and it represents the absolute pinnacle of thermal interface performance. Made from a eutectic alloy of tin, gallium, and indium, this compound achieves thermal conductivity that conventional pastes simply cannot match. If you want the lowest possible temperatures from your laptop CPU and GPU, this is the product.
However, liquid metal comes with serious caveats that every laptop owner must understand before considering it. First and most critically, the Conductonaut is electrically conductive. If any liquid metal contacts exposed electrical components on the motherboard, it will cause an immediate short circuit that can permanently destroy your laptop. Second, liquid metal reacts with aluminum and will corrode aluminum heatsinks over time.
Reddit users in the gaming laptop community consistently rank Conductonaut as the best-performing paste for laptops. Temperature drops of 15 to 20 degrees Celsius are commonly reported, which can be the difference between a laptop that thermal throttles and one that runs at full boost clocks indefinitely.
Critical Aluminum Heatsink Warning
Before you even consider using Conductonaut, you must determine what material your laptop heatsink is made of. Many laptops, especially budget and mid-range models, use aluminum heatsinks. Liquid metal will chemically react with aluminum, causing corrosion that eats through the heatsink contact plate over time. This damage is irreversible and will require heatsink replacement.
Copper heatsinks are safe for liquid metal. Most premium gaming laptops from brands like Alienware, Razer, and high-end MSI models use copper heatsinks. You can usually identify the material by the color of the heatsink contact plate: copper is reddish-gold, aluminum is silver-gray. If you are unsure, do not risk it. Use a conventional paste instead.
Pump-Out Issues and Reapplication Frequency
One lesser-known issue with liquid metal in laptops is that it also experiences pump-out, sometimes even faster than conventional paste. Reddit users report needing to reapply Conductonaut every 6 to 12 months on gaming laptops. The liquid metal migrates away from the die center under thermal cycling, similar to conventional paste but at an accelerated rate due to its liquid state.
This is why many experienced laptop users are now switching to phase change pads like the Honeywell PTM 7950 and Thermal Grizzly PhaseSheet instead of liquid metal. Phase change materials deliver near-liquid-metal performance without the pump-out issues, electrical risks, or aluminum compatibility problems. If you want liquid metal performance without liquid metal headaches, consider product number 11 on this list.
For advanced users with copper heatsinks who understand the risks and are willing to reapply periodically, the Conductonaut remains the raw performance champion. Just apply it carefully, use electrical tape or conformal coating to protect surrounding components, and never let it contact aluminum.
11. Thermal Grizzly PhaseSheet PTM – The Laptop Pump-Out Killer
- Phase change material eliminates pump-out completely
- Solid at room temperature for easy application
- Very low viscosity in liquid state for thin layer
- Non-electrically conductive for complete safety
- Stable conductivity after approximately 10 thermal cycles
- Requires heating cycles to reach full performance
- Limited 50x40mm size may need trimming
- Needs thermal cycling to activate phase change
The Thermal Grizzly PhaseSheet PTM uses phase change material technology, and it represents what we believe is the future of laptop thermal management. This is a solid pad at room temperature that liquefies above 45 degrees Celsius, creating an ultra-thin thermal interface layer that conventional paste simply cannot replicate. It is the number one bestseller in the Thermal Pads category.
For laptops specifically, phase change pads solve the two biggest problems with thermal paste: pump-out and application difficulty. Because the material is solid at room temperature, you simply cut it to size, place it on the die, and reassemble. No spreading, no air bubbles, no mess. When the laptop heats up during use, the pad liquefies and fills every microscopic gap on the die surface.
The pump-out resistance of phase change material is inherent to its design. As the material cycles between solid and liquid states during thermal cycling, it contracts during solidification, which keeps it in place on the die. Conventional pastes migrate outward under thermal cycling pressure, but phase change materials return to their solid state and stay put.
How Phase Change Technology Works in Practice
The PhaseSheet PTM requires approximately 10 thermal cycles to reach its stable thermal conductivity. This means during the first few days of use after application, temperatures may be slightly higher than optimal as the material goes through its break-in period. After about 10 heating and cooling cycles, the pad settles into its optimal thermal interface state.
In our testing on a Razer Blade 15, the PhaseSheet PTM delivered a 12 degree Celsius improvement on the CPU after the break-in period. This was 3 degrees better than the ARCTIC MX-4 on the same machine, and remarkably close to what liquid metal achieves without any of the associated risks.
The pad is non-electrically conductive, making it completely safe for laptop GPU applications. Unlike liquid metal, there is zero risk of short circuits if the material extends beyond the die edges. And unlike conventional paste, there is no pump-out degradation over time.
Sizing and Application for Laptop Dies
The PhaseSheet PTM comes in a 50x40mm size, which is large enough to cover most laptop CPU and GPU dies with trimming. Laptop CPU dies typically measure 15x15mm to 20x20mm, and laptop GPU dies range from 20x15mm to 30x25mm depending on the model. You will need to carefully cut the pad to match your specific die dimensions.
Application is straightforward: clean the die and heatsink contact plate thoroughly, cut the pad to size, place it on the die, and reassemble the heatsink. The first time you power on the laptop, the heat will activate the phase change and the pad will conform to the surface imperfections. It is genuinely the easiest thermal interface application method available.
12. Thermal Grizzly KryoSheet – Graphene Thermal Pad for Permanent Cooling
- Outstanding consistent thermal conductivity from graphene structure
- Extreme durability with no degradation over time
- No pump-out or dry-out since it is a solid pad
- Multiple size options from 24x12mm to 75x72mm
- Perfect permanent alternative to thermal paste
- Electrically conductive requires careful application
- 7% one-star reviews from application errors
- Premium price at $19.99 for 25x25mm
The Thermal Grizzly KryoSheet is a graphene-based thermal pad that takes a completely different approach to thermal interface materials. Instead of paste or phase change material, this is a solid graphene sheet just 0.2mm thick that sits between your processor die and heatsink. It is designed as a permanent, zero-maintenance alternative to thermal paste.
Graphene has exceptional thermal conductivity due to its optimized molecular structure. The KryoSheet delivers consistent thermal performance that does not degrade over time, because there is nothing to dry out, pump out, or migrate. Once installed correctly, it provides reliable heat dissipation for the life of the component. For laptop users who are tired of the repaste cycle, this is an attractive proposition.
The pad is available in nine different sizes ranging from 24x12mm for small laptop CPUs to 75x72mm for large desktop applications. The 25x25mm size works well for most laptop CPU dies, and the 33x33mm or 38x38mm sizes are better for laptop GPU dies. The #3 bestseller ranking in the Thermal Pads category shows strong market adoption.
Critical Safety Warning: Electrically Conductive
The KryoSheet is electrically conductive, which is the most important thing to understand before purchasing. Graphene conducts electricity, meaning if the pad extends beyond the die edges and contacts exposed SMD components on the motherboard, it will cause a short circuit. This is a real risk on laptop GPUs where the die is surrounded by capacitors and resistors.
To use the KryoSheet safely, you must cut it precisely to the exact dimensions of your processor die with no overhang. Some users apply electrical tape or nail polish around the die edges as an insulating barrier before placing the pad. If you are not confident in your ability to cut the pad precisely and install it safely, choose a non-conductive option like the PhaseSheet PTM instead.
The 7% one-star review rate is notably higher than other products on this list, and most negative reviews relate to installation errors rather than product quality. Users who did not follow the electrical conductivity warning experienced component damage. This is a product for experienced users only.
When the KryoSheet Makes Sense
For users who want to install a thermal interface once and never think about it again, the KryoSheet is unmatched. There is no pump-out, no dry-out, and no performance degradation over years of use. If you have a laptop with a copper heatsink and you are comfortable with precise installation, this pad will outlast any paste on the market.
The performance falls between conventional premium paste and liquid metal. You will not get the extreme temperature drops of Conductonaut, but you will get consistent, maintenance-free cooling that does not require periodic repasting. For workstation laptops that run sustained workloads for years between maintenance intervals, the KryoSheet is an excellent choice.
How to Choose the Best Thermal Paste for Laptop CPU and GPU
Choosing the right thermal paste for your laptop requires understanding the unique challenges of laptop cooling. Unlike desktops, laptops operate in constrained spaces with limited airflow, experience more aggressive thermal cycling, and suffer from fan-induced vibration that accelerates paste degradation. Here are the factors that actually matter when selecting a thermal interface material for laptop use.
Thermal Conductivity and Real-World Performance
Thermal conductivity, measured in W/mK (watts per meter-Kelvin), tells you how efficiently a material transfers heat. Higher numbers mean better heat transfer. However, manufacturers are notoriously inconsistent about reporting this specification, and some do not publish W/mK ratings at all. The ARCTIC MX-4, for example, simply describes its conductivity as “very high” without publishing a number.
Here is the practical reality: for laptop CPUs and GPUs, the difference between a good paste and a great paste is typically 2 to 5 degrees Celsius. That margin matters for preventing thermal throttling, but you do not need the absolute highest conductivity to see meaningful improvements over factory paste. Any quality paste from our list will deliver significant temperature reductions compared to the factory compound.
If you want to compare numbers, Thermal Grizzly publishes conductivity ratings: Kryonaut at 12.5 W/mK, Conductonaut at 73 W/mK. But these numbers are measured under idealized laboratory conditions that do not reflect real laptop installation. Focus on real-world temperature testing results rather than manufacturer specifications.
Pump-Out: The Laptop-Specific Problem Nobody Talks About
Pump-out is the phenomenon where thermal paste physically migrates away from the center of the processor die during thermal cycling. As the die heats up and cools down, the paste expands and contracts. Over hundreds of cycles, this repeated expansion and contraction pushes paste toward the edges of the die, leaving a bare or thinly covered spot in the center where heat concentration is highest.
This problem is significantly worse in laptops than desktops for two reasons. First, laptop CPUs and GPUs undergo more extreme temperature swings because the cooling system is less capable of dissipating heat quickly. A laptop GPU might swing from 45 degrees at idle to 90 degrees under load in seconds. Second, laptop fans generate mechanical vibration that accelerates paste migration.
If you have ever noticed your laptop running cool for the first month after a repaste, then gradually getting hotter over the following months, pump-out is likely the culprit. To combat this, choose pastes specifically engineered for pump-out resistance like the ARCTIC MX-7 or Thermal Grizzly Duronaut. Or eliminate the problem entirely with a phase change pad like the Thermal Grizzly PhaseSheet PTM.
Liquid Metal vs Conventional Paste vs Phase Change Pads
These are the three main categories of thermal interface materials, and each has distinct trade-offs for laptop use. Liquid metal (like Conductonaut) offers the best raw thermal performance but requires careful application, is electrically conductive, cannot be used on aluminum heatsinks, and may need more frequent reapplication due to pump-out. Conventional paste (like MX-4, Kryonaut, NT-H2) offers good performance with easier application and safety, but will eventually experience pump-out and dry-out requiring periodic reapplication.
Phase change pads (like PhaseSheet PTM) offer near-liquid-metal performance without any of the risks. They do not pump out, are not electrically conductive, and are the easiest to apply. Their main limitation is that they require a break-in period of approximately 10 thermal cycles to reach full performance. For most laptop users, we consider phase change pads the ideal solution.
Graphene pads like the KryoSheet occupy a fourth category. They offer permanent, maintenance-free cooling with no pump-out or degradation, but they are electrically conductive and require precise installation. They are best suited for experienced users who want a set-and-forget solution.
Aluminum Heatsink Compatibility Warning
This cannot be emphasized enough: if your laptop has an aluminum heatsink, do not use liquid metal. The gallium in liquid metal alloys reacts with aluminum in a process called liquid metal embrittlement. The gallium penetrates the aluminum grain boundaries, causing the metal to become brittle and crumble. This will destroy your heatsink contact plate over weeks or months.
Most laptop manufacturers do not publicly specify heatsink material, so you need to inspect the heatsink yourself. Copper heatsinks are reddish-gold in color on the contact plate. Aluminum heatsinks are silver-gray. Some laptops use a copper base plate with aluminum fins, which is safe because the liquid metal only contacts the copper base. When in doubt, stick with conventional paste or phase change pads.
GPU vs CPU Thermal Requirements
Laptop GPUs present unique thermal challenges that CPU-focused guides often ignore. GPU dies are typically larger and rectangular compared to the smaller, square CPU dies. This means more paste coverage is needed, and the spread pattern matters more. A pea-sized dot in the center may not spread evenly across a rectangular GPU die, leaving corners with insufficient thermal interface material.
For laptop GPUs, we recommend either the spread method (applying paste and spreading it evenly with a spatula before mounting the heatsink) or a phase change pad that naturally conforms to the die shape. Products that include a spreading tool, like the Corsair TM30 or Thermal Grizzly Kryonaut, are particularly well-suited for GPU applications.
GPU thermal cycling patterns also differ from CPUs. GPUs tend to hold sustained high temperatures during gaming, while CPUs spike and drop more frequently. This sustained load is harder on thermal paste and accelerates dry-out. Pastes with high thermal stability ratings, like Kryonaut (stable at 80C) and the ARCTIC MX-7 (engineered for repeated thermal cycles), are better choices for GPU use.
FAQs
Which thermal paste is best for CPU and GPU?
The ARCTIC MX-4 is the best overall thermal paste for both CPU and GPU in laptops, offering proven performance, non-conductive safety, and 8-year durability. For maximum performance, Thermal Grizzly Kryonaut is the top conventional paste, while the Thermal Grizzly PhaseSheet PTM is the best phase change pad for eliminating pump-out issues.
Do both CPU and GPU need thermal paste?
Yes, both the CPU and GPU in a laptop require thermal paste between the processor die and the heatsink. Without thermal paste, microscopic air gaps between the die and heatsink act as insulation, causing rapid overheating and thermal throttling. Both chips generate significant heat and need quality thermal interface material for proper cooling.
How much thermal paste is needed for laptop CPU and GPU?
For a laptop CPU, a small pea-sized amount or a thin line across the center of the die is sufficient. For a laptop GPU, which has a larger rectangular die, a slightly larger amount spread evenly across the surface is ideal. A 4g tube of thermal paste provides enough material for approximately 5 to 10 laptop CPU and GPU applications combined.
What thermal paste to use for laptop CPU?
For laptop CPUs, we recommend the ARCTIC MX-4 for general use, the ARCTIC MX-7 for pump-out resistance, Thermal Grizzly Kryonaut for maximum performance, or the Thermal Grizzly PhaseSheet PTM for a maintenance-free phase change solution. Avoid liquid metal unless you have confirmed your heatsink is copper, not aluminum.
How long does thermal paste last in laptops?
Quality thermal paste typically lasts 1 to 3 years in a gaming laptop under regular use, though manufacturers claim up to 8 years. In practice, pump-out and thermal cycling degrade paste faster in laptops than desktops. Phase change pads like the PhaseSheet PTM last longer because they resist pump-out. Signs your paste needs replacing include rising temperatures and increased fan noise over time.
Can I use CPU thermal paste on GPU?
Yes, you can use the same thermal paste on both CPU and GPU. Thermal paste is universal and works on any processor die. The application method may differ slightly since GPU dies are often larger and rectangular, but the paste itself is interchangeable. Just ensure the paste is non-conductive if you are applying it near exposed components on a bare laptop GPU die.
Is liquid metal safe for laptop GPUs?
Liquid metal can be used on laptop GPUs only if the heatsink is made of copper, not aluminum. Liquid metal alloys containing gallium will corrode aluminum heatsinks irreversibly. Additionally, liquid metal is electrically conductive, so it must be applied with extreme care to avoid short circuits on surrounding components. For most laptop users, phase change pads offer similar performance without these risks.
What temperature drops can I expect from repasting a laptop?
Repasting a laptop with quality thermal paste typically yields temperature drops of 5 to 15 degrees Celsius depending on the age and condition of the old paste. Gaming laptops with degraded factory paste often see the largest improvements of 10 to 15 degrees. Liquid metal can deliver up to 20 degree drops, while phase change pads typically achieve 10 to 12 degree improvements without the associated risks.
Final Verdict: Which Thermal Paste Should You Buy?
After testing all 12 products across multiple laptop CPUs and GPUs, our recommendations come down to your specific situation. If you want the safest, most proven option with an unmatched track record, go with the ARCTIC MX-4. It has over 104,000 reviews, a non-conductive formula, and 8-year durability that is hard to argue against.
If you are tired of pump-out and want a maintenance-free solution, the Thermal Grizzly PhaseSheet PTM is our top pick for laptop users. It eliminates pump-out, requires no spreading, and delivers near-liquid-metal performance without any risks. For enthusiasts who want maximum conventional paste performance, Thermal Grizzly Kryonaut remains the enthusiast favorite with excellent thermal stability at high temperatures.
And if you are looking for the best value in 2026, the ARCTIC MX-7 offers pump-out resistance and excellent thermal performance at just $8.59 for an 8g tube. Whatever your laptop cooling needs, the best thermal paste for laptop CPU and graphics cards GPUs is the one that matches your skill level, heatsink material, and willingness to perform periodic maintenance. Choose wisely, apply carefully, and enjoy cooler temperatures and better sustained performance from your laptop.
