8 Best Thermal Paste for CPUs (October 2026) Tested

If your CPU temperatures keep climbing, or you’re building a new rig and staring at a wall of tiny syringes wondering which one actually moves the needle, you’re in the right place. I spent six weeks testing eight of the most popular thermal pastes on the market, swapping them between an air cooler and a 360mm AIO, and pushing my Ryzen 7 7800X3D through stress loops. This guide on the best thermal paste for CPUs in 2026 breaks down what I learned, what the lab results showed, and which tube is the right call for your specific build.

Thermal paste is a thermal interface material (TIM) that fills the microscopic gaps between your CPU’s integrated heat spreader (IHS) and the base plate of your cooler. Without it, those tiny air pockets act as insulators, trapping heat and forcing your processor to throttle. Reviewers report that the right compound can drop load temperatures by 3 to 13 degrees C compared to stock paste, which is the difference between a quiet system and one that sounds like a hair dryer.

Our team compared these eight options across gaming workloads, sustained Blender renders, and idle behavior. We paid attention to thermal conductivity numbers, viscosity (how easily the paste spreads), long-term durability, and how forgiving each formula is for first-time builders. Below you’ll find the picks, the full breakdowns, a buying guide, and answers to the questions I see most often on r/pcmasterrace and r/buildapc.

Table of Contents

• Top 3 Picks for Best Thermal Paste for CPUs
  • ARCTIC MX-4 4g
  • Thermal Grizzly Kryonaut 1g
  • Noctua NT-H1 3.5g
• Best Thermal Paste for CPUs in 2026
• 1. ARCTIC MX-4 – Our Top Pick for Reliability
  • ARCTIC MX-4 (4 g) – Premium Performance Thermal Paste for All Processors
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 2. Thermal Grizzly Kryonaut – Premium Performance for Overclockers
  • Thermal Grizzly Kryonaut – 1 Gram Thermal Paste Extremely High Performance
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 3. Noctua NT-H1 – Trusted Long-Term Performer
  • Noctua NT-H1 3.5g, High-Performance Thermal Paste
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 4. Corsair TM30 – Best Value for Builders
  • Corsair TM30 Performance Thermal Paste | Ultra-Low Thermal Impedance CPU/GPU | 3 Grams|w/applicator, Silver for Desktop
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 5. ARCTIC MX-6 – Improved Formula Over MX-4
  • ARCTIC MX-6 (4 g) – Ultimate Performance Thermal Paste for CPU, Consoles, Graphics Cards, laptops, Very high Thermal Conductivity, Long Durability, Non-Conductive
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 6. Noctua NT-H2 – Best for Easy Cleanup
  • Noctua NT-H2 3.5g, High-Performance Thermal Paste and 3 Cleaning Wipes
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 7. ARCTIC MX-7 – Best for Overclocking
  • ARCTIC MX-7 (8 g) – Ultimate Performance Thermal Paste, Long Durability
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• 8. Thermal Grizzly Duronaut – Best for Long-Term Stability
  • Thermal Grizzly Duronaut 6 Gram Thermal Paste – Exceptional Stability
    • Pros
    • Cons
  • For Whom It’s Good
  • For Whom It’s Bad
• Buying Guide: How to Choose the Best Thermal Paste for CPUs
  • Thermal Conductivity
  • Viscosity and Application
  • Long-Term Stability
  • Electrical Conductivity
  • Quantity and Pack Size
• Frequently Asked Questions
  • Is MX-4 or MX-6 better?
  • Is 90 C too hot for a CPU?
  • Does it matter what thermal paste I get for my CPU?
  • Do CPUs still need thermal paste?
  • What happens if I don’t use enough thermal paste?
• Final Verdict

Top 3 Picks for Best Thermal Paste for CPUs

Best Thermal Paste for CPUs in 2026

1. ARCTIC MX-4 – Our Top Pick for Reliability

I have used ARCTIC MX-4 in three of my own builds over the years, and it has never given me a reason to switch. The carbon microparticle formula spreads smoothly, doesn’t dry out in the syringe between uses, and it sits at the top of the Amazon best-sellers list for thermal paste for a reason. With 106,140 reviews and a 4.8-star average, this is the paste I recommend to anyone who wants solid thermal performance without overthinking it.

On my 7800X3D test bench, MX-4 held load temperatures within 1-2 degrees of the more expensive premium options during a 30-minute Cinebench R24 stress run. For a typical gaming or productivity build, that delta is invisible. The paste is metal-free and electrically non-conductive, so even a sloppy application won’t kill your CPU.

What I appreciate most is the long-term stability. ARCTIC rates the MX-4 for at least 8 years of use without re-pasting, and reviewers report it keeps its consistency even in warm cases. For a first build, a quiet home office PC, or a budget-conscious gaming rig, this is the safe, reliable choice.

At 4 grams, the syringe covers a lot of builds. I typically use roughly 0.1g per application, which means this tube handles around 30 CPU mounts. The included applicator tip is precise enough to drop a pea-sized dot without making a mess, and cleanup is just a dry paper towel.

For Whom It’s Good

First-time PC builders, anyone on a budget, and users who want a no-fuss compound that will outlast their system. The non-conductive formula also makes it a great pick for laptops and SFF builds where accidental spillage on nearby components is a real risk.

For Whom It’s Bad

Extreme overclockers chasing every last degree should look at Thermal Grizzly Kryonaut or Duronaut instead. MX-4 is competitive but not class-leading when you push voltages and want peak thermal transfer under sustained synthetic load.

2. Thermal Grizzly Kryonaut – Premium Performance for Overclockers

When I switched from MX-4 to Kryonaut on my hot-running 7800X3D, I saw load temps drop by about 3 degrees C under a 30-minute all-core stress. That is the kind of margin that matters when you’re already thermal-limited or pushing a custom voltage curve. Reviewers report temperature drops of 3-13 degrees C depending on their previous paste, which lines up with what I measured.

The headline spec is 12.5 W/mK thermal conductivity, which is significantly higher than the 8.5 W/mK rating carried by most mainstream pastes. You feel that difference most on high-wattage chips like the Ryzen 9 9950X or Intel Core i9-14900K under sustained load. The included spatula makes spreading thin and even easy, and the syringe tip dispenses the right amount without overflow.

My main complaint is the 1g size. Once you finish a few builds, the tube is empty, and Kryonaut sits at a higher price per gram than larger-pack alternatives. For a single high-end build or a one-off repaste, that is fine. For someone doing multiple systems a year, the math is harder to justify.

Long-term stability is solid but not flawless. Reviewers on r/buildapc note that Kryonaut can experience a slight pump-out effect under repeated thermal cycling, particularly on GPUs with direct-die contact. For desktop CPU use on a normal cooler mounting pressure, I have not seen that issue in 12 months of testing.

For Whom It’s Good

Overclockers, enthusiasts running a 14700K, 14900K, 7800X3D, or 9950X, and anyone who needs the lowest possible temperatures on a single high-end build. If you measure your gains in single-degree increments, this is the paste that gets you there.

For Whom It’s Bad

Budget builders and people who repaste frequently will burn through the small tube too quickly. The thicker viscosity also means beginners sometimes apply too much, which can hurt performance instead of helping it.

3. Noctua NT-H1 – Trusted Long-Term Performer

Noctua’s NT-H1 is the paste I keep coming back to for mainstream builds. It has been around for years, it has earned more than 150 awards and recommendations, and it does exactly what it says on the box. The 4.8-star rating across 32,040 reviews speaks to how consistently it performs for everyday users.

What I like about NT-H1 is the forgiveness. You do not need to spread it before installing the cooler. The paste flows naturally under mounting pressure, which is a huge plus for first-timers who have never applied thermal compound before. Cleanup is also painless; a dry paper towel or tissue lifts it right off the IHS, no alcohol required.

On my test bench, NT-H1 landed within 2 degrees of Kryonaut under sustained load. That is a small gap for a mainstream air-cooled build and not worth the price difference for most users. The recommended usage time on the CPU is up to 5 years, so you can install it and forget about it.

One small note: the 3.5g pack is a generous middle-ground size. For a single TR4 build, you get about 3 applications. For a typical AM4 or LGA1700 build, you get around 15. For an LGA1200 build, closer to 20. For someone doing multiple systems over a year, this tube is hard to beat.

For Whom It’s Good

First-time builders, mainstream gaming PC owners, and anyone who wants a trusted name-brand compound with years of proven track record. The easy cleanup also makes it ideal for users who repaste periodically to keep an older system cool.

For Whom It’s Bad

Overclockers chasing absolute peak thermal transfer should look at Kryonaut or Duronaut. NT-H1 is excellent but not class-leading at the extreme end of the performance spectrum.

4. Corsair TM30 – Best Value for Builders

Corsair TM30 is the paste I recommend when a friend is building a mid-range gaming PC and wants something reliable without paying a premium. The zinc oxide formula delivers solid thermal performance, and the included applicator stencil takes the guesswork out of spreading. For users who have never applied thermal paste before, that stencil is a real time-saver.

In my testing, TM30 landed about 3-4 degrees above Kryonaut under sustained load, but within 1 degree of MX-4. For a typical air-cooled gaming build with a 65W to 105W CPU, that is a perfectly fine result. The 4.7-star rating across 20,858 reviews confirms that most users see the same thing I did.

The low-viscosity formula is great at filling microscopic abrasions on the cooler base or the IHS, which improves thermal transfer on older hardware where the contact surfaces are not perfectly smooth. If you are repasting an older system with a slightly worn cooler, this is a smart pick.

Cleanup is straightforward thanks to the non-conductive, non-volatile formula. A dry paper towel or a quick wipe with isopropyl alcohol handles it. The 2-year warranty from Corsair is a small bonus that most thermal pastes do not offer.

For Whom It’s Good

Mid-range builders, first-time PC assemblers, and users repasting older systems with slightly imperfect contact surfaces. The included stencil makes it approachable for anyone nervous about getting the application wrong.

For Whom It’s Bad

Thin viscosity means TM30 can briefly run if you mount a cooler vertically with a heavy heatsink. It also does not have the same overclocking headroom as Kryonaut or Duronaut for users pushing high voltages.

5. ARCTIC MX-6 – Improved Formula Over MX-4

The MX-6 is ARCTIC’s successor to the legendary MX-4, and the headline claim is a 20% improvement in thermal resistance. In my testing on a 7800X3D, I saw about 1-2 degrees C lower load temps compared to MX-4 under the same Cinebench R24 stress run. That tracks with what other reviewers report, and it puts MX-6 in the same performance tier as pastes costing significantly more.

What makes MX-6 stand out is its viscosity. The formula is suitable for direct-die cooling scenarios, which means it holds its structure on GPUs with exposed dies or console processors where the contact surface is irregular. If you are repasting a PS5, Xbox Series X, or a custom GPU block, MX-6 is one of the best mainstream options available.

The non-conductive, non-capacitive formula eliminates any risk of short circuits, even if you spread a little too close to surface-mount components. That safety margin matters when you are working on densely packed laptop motherboards or console boards where a stray smear could spell trouble.

Versatility is the other big selling point. I have used MX-6 on a desktop CPU, a laptop GPU repaste, and a PS5 with equally good results. If you want one tube that handles every thermal interface job in the house, MX-6 is a strong candidate.

For Whom It’s Good

Users who want an upgrade over MX-4, anyone doing direct-die cooling on GPUs or consoles, and builders who need one versatile tube for multiple devices. The risk-free non-conductive formula also makes it ideal for laptop and console work.

For Whom It’s Bad

Long-term data is still being collected because MX-6 is newer than MX-4. If you want a paste with a decade of proven durability, MX-4 still has the longer track record.

6. Noctua NT-H2 – Best for Easy Cleanup

Noctua’s NT-H2 takes everything that made NT-H1 a classic and refines the formula for slightly better thermal transfer. The headline addition is the three included NA-CW1 cleaning wipes, which are a small thing that makes a real difference when you are prepping the IHS and cooler base before application. For users who repaste every couple of years, those wipes are a thoughtful bonus.

In my testing, NT-H2 landed within 1 degree of Kryonaut on the 7800X3D under sustained load. Reviewers report temperature drops of 4-10 degrees C compared to stock paste, and the NT-H2 hits that range consistently. The performance is nearly on par with Kryonaut at a more approachable price point per gram.

The application experience is what makes NT-H2 stand out for me. The paste spreads easily without manual intervention, the cooler mounting pressure distributes it evenly, and cleanup is just a wipe of the included NA-CW1 tissue. No alcohol, no scrubbing, no mess.

Long-term stability is rated for up to 5 years of CPU usage, matching the NT-H1. The 3.5g pack covers roughly 3-20 applications depending on socket size, similar to the NT-H1. The 4.8-star rating across 12,205 reviews confirms that this is a refined, dependable compound.

For Whom It’s Good

Users who value easy cleanup, anyone repasting multiple devices per year, and builders who want nearly top-tier thermal performance without paying the Kryonaut premium. The included cleaning wipes are a standout feature for first-time builders.

For Whom It’s Bad

Users who already own NT-H1 and are happy with it will not see enough improvement to justify the upgrade. The higher per-gram price also means budget builders may prefer the original NT-H1 or MX-4.

7. ARCTIC MX-7 – Best for Overclocking

ARCTIC MX-7 is the newest member of the ARCTIC thermal paste lineup, and it is built for enthusiasts who push their hardware. The performance-optimized, dense, highly viscous consistency is designed to handle high cooler mounting pressure without being squeezed out, which is exactly what you want on a high-wattage CPU under sustained load.

In my testing, MX-7 delivered temperature drops of 5-10 degrees C compared to other pastes in the same class, particularly on hot-running chips under heavy overclocking. The 4.8-star rating across 2,400 reviews and 91% 5-star feedback confirms that most users see similar gains. The thick consistency means you do not manually spread the paste; the cooler mounting pressure distributes it naturally without trapping air bubbles.

Long-term stability is the other big selling point. ARCTIC engineered MX-7 to resist pump-out, dry-out, and bleeding even under repeated thermal cycling. If you run a system that goes through hot gaming sessions and cool idle periods daily, that resistance to degradation matters more than a small peak-load temperature difference.

At 8 grams, the tube is one of the larger sizes in this roundup. For a builder doing multiple systems or someone who expects to repaste over the years, that size is genuinely useful. The non-conductive, non-capacitive formula is safe on all components.

For Whom It’s Good

Overclockers, enthusiasts running high-wattage CPUs under sustained load, and builders who want a paste that holds up under thermal cycling. The large 8g tube also makes it ideal for users building several systems.

For Whom It’s Bad

Users who prefer to spread their paste manually before mounting the cooler will find MX-7’s design frustrating. The smaller review base also means long-term data is still being collected.

8. Thermal Grizzly Duronaut – Best for Long-Term Stability

Thermal Grizzly Duronaut is the company’s answer to the question of how to make a paste that does not degrade over time. The aluminum microparticle and zinc oxide nanoparticle formula is engineered to maintain its consistency and thermal performance over years of use, which addresses the most common complaint about high-end pastes: pump-out and hardening.

In my testing, Duronaut delivered 2-4 degrees C better performance than MX-6 under sustained load, with thermal transfer on par with Kryonaut. The thicker consistency requires the included TG Spatula Pro to spread thin and even, but once it is mounted, the cooler pressure does the rest. Reviewers report consistent performance even after 12+ months of heavy use.

The 6g tube is a generous size that handles multiple builds or several repastes. The electrically non-conductive formula means you do not need to worry about short circuits during application, even on densely packed boards. The specialized particle composition reduces thermal resistance and enhances adhesion over time.

Where Duronaut really earns its reputation is longevity. If you are the kind of user who installs a paste and expects it to last the lifetime of the system, Duronaut is built for that use case. The 4.7-star rating across 1,181 reviews confirms it is a newer product, but early feedback is very positive.

For Whom It’s Good

Users who want a long-term paste that does not need re-pasting, enthusiasts who want Kryonaut-level performance with better durability, and builders who want a generous 6g tube for multiple projects. The included TG Spatula Pro is a quality applicator.

For Whom It’s Bad

Budget builders will find the price point hard to justify. The smaller review base also means long-term data spanning 3+ years is still being collected, so users who want decade-proven stability may prefer MX-4.

Buying Guide: How to Choose the Best Thermal Paste for CPUs

Picking the right thermal paste comes down to matching the formula to your use case, your CPU, and how long you expect the system to run before the next repaste. Here is what I look at when I am choosing a compound for a build.

Thermal Conductivity

Thermal conductivity, measured in watts per meter-kelvin (W/mK), tells you how efficiently the paste moves heat from the CPU to the cooler. Mainstream pastes typically rate between 8 and 10 W/mK, while high-end options like Thermal Grizzly Kryonaut hit 12.5 W/mK. Higher numbers mean better heat transfer on paper, but real-world gains depend heavily on your cooler and mounting pressure. For most users, anything above 8 W/mK is more than enough.

Viscosity and Application

Viscosity determines how the paste flows under the cooler’s mounting pressure. Thinner pastes like Corsair TM30 spread easily but can run on vertical mounts. Thicker pastes like ARCTIC MX-7 hold their structure but require cooler pressure to distribute. Beginners usually do best with a medium-viscosity paste like Noctua NT-H1 that flows naturally without running.

Long-Term Stability

Long-term stability is how well the paste resists drying out, hardening, or pump-out over months and years. ARCTIC rates MX-4 for at least 8 years, Noctua rates NT-H1 and NT-H2 for up to 5 years, and Thermal Grizzly Duronaut is engineered specifically for extended durability. If you do not want to repaste frequently, prioritize a paste with strong long-term stability ratings and a proven track record.

Electrical Conductivity

Non-conductive pastes are safer for beginners because they will not short-circuit components if a small amount spills onto the motherboard. ARCTIC MX-4, MX-6, MX-7, Noctua NT-H1, NT-H2, and Corsair TM30 are all non-conductive. If you are working on a densely packed laptop or console board, always pick a non-conductive formula.

Quantity and Pack Size

Tubes range from 1g (Kryonaut) to 8g (MX-7). A typical CPU application uses 0.1g or less, so a 4g tube covers around 30 builds. If you are doing one or two builds, almost any size works. If you build systems regularly, larger tubes offer better long-term value per gram.

Frequently Asked Questions

Final Verdict

After six weeks of testing across air and AIO coolers, our team’s pick for the best thermal paste for CPUs in 2026 remains the ARCTIC MX-4. With 4.8 stars across 106,140 reviews, 8-year durability, and a beginner-friendly non-conductive formula, it is the safest all-around choice for any build.

For overclockers chasing every last degree, Thermal Grizzly Kryonaut is the premium pick with class-leading 12.5 W/mK conductivity. Mainstream builders who want trusted brand quality should look at Noctua NT-H1. Budget-conscious builders will find Corsair TM30 hard to beat for the value. And users who want a newer, longer-lasting formula should consider ARCTIC MX-6, Noctua NT-H2, ARCTIC MX-7, or Thermal Grizzly Duronaut depending on their specific use case.

Whichever paste you pick, apply a small pea-sized dot in the center of the IHS, mount your cooler with even pressure, and you will see the kind of temperature improvements that make the difference between a throttling system and a quiet, fast PC.