Best CPU Cooling Paste in 2026: 7 Thermal Compounds

The best CPU thermal paste for most people in 2026 is Arctic MX-6: it is non-conductive, easy to apply, widely available in generous quantities, and lands within a couple of degrees Celsius of pastes that cost several times more. Thermal Grizzly Kryonaut Extreme is the pick when you want the last few degrees from an overclocked or very hot processor, and Noctua NT-H2 is the pick for a long-lived, set-and-forget installation.

Thermal paste is a small purchase with an outsized reputation, so this guide separates what actually matters from marketing. It compares seven real compounds, explains why published conductivity numbers can mislead, shows a worked example of what a few degrees are worth, and walks through application and replacement. Figures come from manufacturer datasheets and independent measurements, and where sources disagree this guide says so.

Our top picks

Top pickARCTIC MX-4

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Also greatARCTIC MX-7

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Also greatARCTIC MX-7

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Also greatARCTIC MX-7

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Quick comparison of the seven picks

What thermal paste actually does

A processor’s heat spreader and a cooler’s cold plate look flat, but at microscopic scale both are rough. Air trapped in those gaps conducts heat poorly. Thermal paste fills the gaps with a material that conducts heat far better than air, so more of the processor’s power reaches the cooler. It does not replace good contact; a thin layer under firm pressure works best. A thick layer insulates, which is why more is never better.

The difference between a bad application and a good one can be larger than the difference between two good pastes. A missing or uneven layer, an air bubble or a loose cooler can cost much more than switching from one premium compound to another.

Why conductivity numbers mislead

Marketing pages quote thermal conductivity in watts per meter-kelvin, and the numbers range from about 4 to well above 14. These figures are not directly comparable. Manufacturers measure them with different methods, some quote the filler material rather than the finished paste, and the practical result depends heavily on the bond-line thickness, which is how thin the paste spreads under pressure. Independent lab measurements, including those published by Igor’s Lab, have found effective conductivity for popular pastes far below the headline numbers, and the ranking by real-world temperature does not always follow the ranking by printed figure.

Arctic, for example, does not publish a conductivity rating for MX-6 at all, while some retailers list a number that appears to be misattributed from another specification. Noctua also does not publish a bulk conductivity for NT-H2, and Igor’s Lab measured an effective figure of around 2.9 W/(m·K) in its own setup, yet that paste performs near the top in real coolers. The lesson: use conductivity as a rough hint, and rely on temperature comparisons from independent reviewers instead.

Best overall: Arctic MX-6

MX-6 is the paste most 2026 roundups recommend to a general audience. Arctic quotes a density of 2.6 g/cm3, a continuous-use range of -50 to 150 degrees Celsius, a volume resistivity of 1.8 x 10^12 ohm-cm and a breakdown voltage of 7.5 kV/mm, and claims up to 20 percent better performance than the older MX-4. It is non-conductive and non-capacitive, so an accidental smear on the socket area will not short anything.

It is highly viscous and cannot be spread with a spatula; Arctic recommends relying on the cooler’s mounting pressure. Who it is for: first-time builders and anyone who wants a dependable result without fuss. Pros: low cost, large tube sizes, forgiving behavior, and inclusion in the box with some Arctic AIO coolers. Cons: because it is stiff, it benefits from a firm, even mount; it may need a few days to settle before reaching its best temperatures.

Best for longevity: Noctua NT-H2

NT-H2 is a grey, non-conductive paste with a specific gravity of 2.81 g/cm3 and an operating range of -50 to 200 degrees Celsius. Noctua suggests it can stay in use on a CPU for up to five years and in storage for up to three years. Kits include cleaning wipes, which makes repasting tidier.

Who it is for: people who install a cooler and do not want to open the case again for years, and users of Noctua coolers who like a matched ecosystem. Pros: easy spreading, stable over time, and tidy accessories. Cons: its measured peak performance trails the best enthusiast pastes, and its price per gram is higher than MX-6.

Best enthusiast classic: Thermal Grizzly Kryonaut

Kryonaut has been the benchmark enthusiast paste for years. Roundups cite a 12.5 W/mK claim, a smooth, easily spread consistency, and non-conductive behavior. It is often sold in 1 g tubes, which is enough for a single CPU but can be tight if you plan to repaste more than once or cover a large processor.

Who it is for: tinkerers who repaste often and want a spreadable paste that performs reliably. Pros: predictable, easy application and consistently strong results. Cons: small tubes make it expensive per use, and the advantage over MX-6 is typically only a degree or two.

Best for overclocking: Thermal Grizzly Kryonaut Extreme

Kryonaut Extreme is Thermal Grizzly’s high-performance step up. Its datasheet lists a thermal conductivity of 14.2 W/mK, a density of 3.76 g/cm3, an operating range of -250 to 350 degrees Celsius, and zero electrical conductivity. It is sold in 2 g, 6 g and 9 ml sizes. Remember that the 14.2 figure is a manufacturer claim and independent comparisons show much smaller differences between premium pastes than the printed values suggest.

Who it is for: overclockers, owners of high-wattage processors and anyone chasing the lowest possible temperature. Pros: top-tier results in enthusiast comparisons and a wide temperature range. Cons: a premium price for small tubes, and a benefit that is modest for stock-speed processors.

Best value high-performance: Thermalright TF7

Thermalright’s TF7 is marketed with a conductivity figure around 12.8 W/mK and appears in independent comparisons with results that rival much costlier pastes. Igor’s Lab included it in a roundup that questioned whether the most expensive pastes are worth their price. It is non-conductive and comes in tubes that suit multiple applications.

Who it is for: value-focused builders who want near-enthusiast performance for less. Pros: excellent price-to-performance and good spreadability. Cons: availability varies by region, and long-term data on pump-out and drying is thinner than for older brands.

Best long-running classic: Gelid GC-Extreme

GC-Extreme has been a favorite for more than a decade. It is marketed at around 8.5 W/mK, has a thicker consistency that resists pump-out, and is non-conductive. Igor’s Lab included it in the same comparison as NT-H2 and TF7, and it held its own.

Who it is for: users who prefer a proven paste with a long track record. Pros: stable behavior, good longevity, and a low risk of unexpected issues. Cons: thicker consistency can take more effort to apply smoothly, and it no longer leads the field on printed numbers.

Best no-pump-out pad: Honeywell PTM7950

PTM7950 is a phase-change pad rather than a paste. It has a published thermal conductivity of 8.5 W/mK, a thermal resistance of 0.04 C-cm2/W, and a phase change at about 45 degrees Celsius, at which point it softens and fills microscopic gaps. A common size is 40 x 40 x 0.2 mm. It resists pump-out over repeated thermal cycles, which is why it is popular in laptops, graphics cards and consoles. In one desktop comparison it performed on par with Arctic MX-4 and Noctua NT-H2, with the lowest temperatures after about eight minutes of load.

Who it is for: owners of systems with frequent hot and cold cycles, or anyone who dislikes repasting. Pros: long-lasting, clean to apply, and not prone to dry-out. Cons: counterfeit pads are common, so buy from a trustworthy seller; the pad must be cut to size, and it needs an initial heat cycle to flow.

Paste, cold plate and cooler type: how they interact

Paste behaves differently depending on what it sits between. On a direct-touch heatpipe cooler, the exposed copper heatpipes leave small grooves between pipes, and a slightly thicker, more viscous paste fills them without running out. On a flat copper cold plate, as on most AIO pump blocks, a thinner paste spreads more evenly and the bond line stays very small. If your cooler ships with a specific compound, such as MX-6 with Arctic AIOs, the maker has generally matched the mounting pressure to that paste, so a swap rarely pays for itself unless you are chasing marginal gains.

The heat spreader on the processor also matters. Modern AMD AM5 processors have a thick heat spreader with a recessed layout, and Intel’s newer sockets use a slightly different contact patch, so a dot at the center remains the most reliable starting point on both. Large workstation processors with wide spreaders may need an X-shaped or line pattern, and the cooler’s manual will say so. Following the maker’s pattern is more important than any brand choice.

Buying quantity and shelf life

Tube size changes the true cost per application. A single desktop installation uses roughly 0.2 to 0.4 g of paste, so a 4 g tube of MX-6 covers many installations, while a 1 g tube of a premium paste covers only a few, especially once you count the amount lost to priming the nozzle. If you build or repair several PCs a year, a larger tube or syringe is the cheaper route. Store tubes upright at room temperature with the cap tight; Noctua suggests keeping NT-H2 for no more than about three years before use, and most manufacturers give similar guidance. A paste that has separated into a runny liquid and a stiff solid should be thrown away rather than stirred.

For a single-build buyer, the practical advice is simple: buy one reasonable tube, use a small amount, and keep the leftover for a future repaste in a few years. For a technician or enthusiast, buy a larger syringe of a proven formula and write the date on it.

What a few degrees are worth

Here is a worked example. Suppose a processor draws 150 W at full load and your cooler-plus-paste stack has a combined thermal resistance of 0.30 C per watt from the chip to the room. The temperature rise over room temperature is 150 x 0.30 = 45 degrees. If a better paste lowers the interface resistance by 0.01 C per watt, the rise falls to 150 x 0.29 = 43.5 degrees, a saving of 1.5 degrees. That is typical of the difference between a good paste and an excellent one. A poorly seated cooler, by contrast, can add 0.05 C per watt or more, costing around 7.5 degrees. Mounting correctness therefore matters several times more than paste brand.

How to apply thermal paste

1. Clean both surfaces. Use isopropyl alcohol of 90 percent or higher and a lint-free cloth. Old paste left behind creates uneven thickness.
2. Add a pea-sized dot to the center. The mounting pressure spreads it outward, and the center is where the hottest part of the die sits on most CPUs.
3. Do not spread it by hand. Most modern pastes are designed to be spread by the cooler’s pressure; hand-spreading can trap air bubbles.
4. Lower the cooler straight down. Avoid twisting or sliding it, which can create gaps.
5. Tighten screws in a cross pattern. Make a few turns on each screw in sequence until they stop for even pressure.
6. Allow a short settling period. Some pastes improve over the first days of use as they flow into microscopic gaps.

When to replace paste

Most quality non-conductive pastes last several years on a desktop processor. Replace it when you remove the cooler for any reason, because a used layer will not reseat correctly. Consider replacing it if temperatures at identical loads drift upward by 5 degrees Celsius or more over a year, if the PC has moved a lot, or if the cooler was installed carelessly. Dust or fan wear can mimic paste failure, so clean the cooler before assuming the compound is the problem.

Safety and common mistakes

• Avoid liquid metal compounds unless your cooler’s base and your CPU are compatible; they conduct electricity and can corrode aluminum.
• Do not use too much paste. Excess squeezes out and can spill onto the socket area.
• Do not reuse old paste or reinstall a cooler without cleaning.
• Do not trust a single conductivity number; compare independent temperature results instead.
• Do not buy paste from unverified marketplaces where counterfeits are common, especially phase-change pads.

Frequently Asked Questions

Does expensive thermal paste make a big difference?

Usually not. Premium compounds typically shave one to four degrees Celsius off a mainstream paste on a high-wattage processor, and the gap is smaller on a stock CPU. A correct mount and a clean surface matter more.

How much thermal paste should I use?

A pea-sized dot, roughly 3 to 4 mm across, is enough for most desktop processors. Larger processors can use a slightly longer line, but too much paste insulates rather than conducts and may spill outside the heat spreader.

Is non-conductive paste safer than metal-based paste?

Yes. All of the compounds in this guide are non-conductive, so a small spill will not short a socket or board. That is why they are the safe default for first-time builders, whereas liquid metal demands careful application.

How often should I replace thermal paste?

Every three to five years is a reasonable rule for desktop processors, or any time you remove the cooler. If temperatures climb steadily at the same load, repaste after cleaning dust from the cooler.

Do coolers need extra paste if they come with some?

Not necessarily. Many coolers ship with pre-applied or included paste that works well, such as the MX-6 that comes with some Arctic AIO coolers. Buy separate paste if you plan to repaste, want the best possible temperatures, or are building multiple PCs.

Is a phase-change pad better than paste?

For laptops, graphics cards and anything that cycles between hot and cold often, a pad such as PTM7950 resists pump-out and lasts well. On a typical desktop CPU the temperature difference is small, so choose it for convenience and longevity rather than for lower temperatures.