Best Thermal Paste 2026: 5 Pastes Worth Buying
Last updated: October 2026
Quick answer: The best thermal pastes in 2026 are Thermal Grizzly Kryonaut (top performance), Noctua NT-H2 (easiest to apply well), and Arctic MX-6 (best value). The difference between the best and worst reputable paste is 2–4°C — so buy any of the five below and focus on applying it correctly.
By PC Bottleneck Calculator · Reviewed October 2026 · Our methodology
Quick comparison
| Paste | Thermal Conductivity | Best for |
|---|---|---|
| Thermal Grizzly Kryonaut | 12.5 W/mK | Maximum performance |
| Noctua NT-H2 | Not published | Easy application, great all-rounder |
| Arctic MX-6 | 10.5 W/mK | Best value |
| Thermal Grizzly Kryonaut Extreme | 14.2 W/mK | Extreme overclocking |
| Corsair XTM70 | Not published | Included applicator kit |
The 5 best thermal pastes
1. Thermal Grizzly Kryonaut — best overall
The enthusiast default for a decade. Genuinely top-tier performance in independent testing, no curing time, and stable for years. Slightly thick — warm the tube in your hands for a minute before applying and it spreads much easier.
2. Noctua NT-H2 — easiest to get right
Noctua's paste is unusually forgiving: it spreads evenly, doesn't pump out quickly, and the included cleaning wipes make repasting painless. Performance is within a degree or two of Kryonaut in most tests. If you've never repasted before, start here.
3. Arctic MX-6 — best value
MX-6 performs close to the flagships at roughly half the price per gram, and the syringe lasts multiple applications. The practical pick for builders who repaste regularly or maintain several PCs.
4. Thermal Grizzly Kryonaut Extreme — for overclockers
Higher conductivity than standard Kryonaut, aimed at sub-ambient and competitive overclocking. For normal use the difference over regular Kryonaut is within margin of error — buy it only if you're chasing records.
5. Corsair XTM70 — best kit
Ships with an applicator stencil and cleaning kit that genuinely help beginners get an even spread. Performance is solid mid-pack; you're paying a little extra for the accessories.
How to apply thermal paste correctly
- Clean first. Remove old paste with isopropyl alcohol (90%+) and a lint-free cloth or coffee filter. The surfaces should be mirror-clean.
- Pea-sized dot in the center. For mainstream CPUs (up to ~8 cores), a pea-sized dot is genuinely all you need — mounting pressure spreads it.
- Line method for large CPUs. For HEDT/threadripper-class chips, use a thin line or X pattern to cover the larger heatspreader.
- Don't spread it manually. The cooler's mounting pressure does a better, bubble-free job than any spatula.
- Tighten in a cross pattern. Alternate diagonal screws, a half-turn at a time, for even pressure.
How much is too much?
Too much paste is messy but mostly harmless — excess squeezes out the sides. Too little is the real problem: dry spots mean direct metal-on-metal contact with air gaps, and air is a terrible conductor. When in doubt, use slightly more rather than less. (Non-conductive ceramic pastes like all five above won't short anything if they squeeze out; liquid metal is a different story — don't use it unless you know exactly what you're doing.)
Thermal pads vs thermal paste: don't confuse them
They solve different problems. Thermal paste fills microscopic gaps between the CPU die (or heatspreader) and the cooler base — two nearly-flat metal surfaces. Thermal pads bridge larger, uneven gaps, typically between VRAM chips or VRMs and heatsinks on graphics cards.
Key differences:
| Thermal paste | Thermal pads | |
|---|---|---|
| Gap size | Microscopic (<0.1mm) | 0.5–3mm |
| Where used | CPU/GPU die to cooler | VRAM, VRM, SSD controllers |
| Reusable | No — replace every time | Sometimes, if intact |
| Conductivity | 5–14 W/mK | 3–8 W/mK typical |
If you're repasting a graphics card, you usually need both: paste for the GPU die, pads for the memory. Measure pad thickness before removing old ones — too thick prevents cooler contact, too thin leaves gaps. When in doubt, 1.0mm and 1.5mm pads cover most cards; check your card's teardown specs.
When to replace thermal paste
- Every 3–5 years for a desktop that runs daily — paste dries out and pumps out over thermal cycles.
- Immediately if temperatures spike 10–15°C above what the same cooler used to deliver.
- Every cooler removal. Never reuse a cooler without fresh paste; the old layer's contact is broken the moment you lift it.
If fresh paste doesn't fix high temperatures, the problem is usually elsewhere — dust-clogged fins, a dying fan, or poor case airflow. And if your CPU is throttling under load, run your parts through our bottleneck calculator to check whether cooling or component balance is the real limit.
Paste can't fix a mismatch — if temperatures are fine but FPS is low, check whether your CPU or GPU is the real limit.
Sources & further reading
- Noctua official site — Thermal compound and cooler specifications.
- Arctic official site — Thermal paste product information.
- Thermal Grizzly official site — Thermal compound specifications and application guides.
Frequently Asked Questions
Does thermal paste brand really matter?
Barely. Between reputable pastes the difference is 2–4°C. Application quality and cooler mounting pressure matter far more than which tube you bought.
Is liquid metal worth it?
For 99% of users, no. It's electrically conductive (one slip kills a motherboard), corrodes aluminum coolers, and gains you 3–8°C over good paste. Stick with conventional paste.
How long does thermal paste last in the tube?
Unopened, 3–5 years stored at room temperature. If it's separated or watery when squeezed out, replace the tube.
Can I use too much thermal paste?
Excess non-conductive paste just makes a mess. The danger is only with conductive liquid metal. Still, a pea-sized dot is the right amount — more doesn't help.
Methodology note: Picks are based on manufacturer-published specifications and long-standing results from independent thermal testing outlets. We don't run our own thermal lab. Conductivity figures are manufacturer-rated; real-world deltas between top pastes are small.