Best CPU TIM in 2026: Paste, Liquid Metal and Pads

The best CPU thermal interface material (TIM) for most builds in 2026 is a non-conductive paste such as Arctic MX-6 or Noctua NT-H2, which land within about a degree of the top-ranked compounds and carry no electrical risk. Choose liquid metal such as Thermal Grizzly Conductonaut Extreme only if you are an experienced builder with a compatible nickel-plated cooler, and consider a phase change pad like Honeywell PTM7950 if you want a long-lasting, no-mess layer.

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 Seven CPU TIM Options

What a Thermal Interface Material Does

The metal surface of a processor’s heat spreader and the metal base of a cooler look flat but are covered in microscopic ridges. Pressed together, they touch at only a fraction of their area, and the gaps hold air, which is a poor conductor of heat. A thermal interface material fills those gaps with something that conducts heat far better than air. The goal is a very thin, complete layer, not a thick insulating one.

The materials fall into three families. Pastes are suspensions of particles, such as ceramic, carbon or metal oxides, in a silicone or other carrier. Liquid metals are gallium-based alloys that are fluid at room temperature and conduct heat much better than any paste. Pads and phase change materials come as solid sheets that conform when warmed or squeezed. Each family trades cooling performance against safety, ease and lifetime.

A Warning About Published Conductivity Numbers

Vendor listings show thermal conductivity in watts per meter-kelvin, but these figures are unreliable for comparing pastes. Reviews that survey the market find the same product listed at wildly different values on different websites: one paste appears at 8.5, 10.2 or 4.0 in different places. According to Sunbeam’s analysis, Thermal Grizzly stopped publishing conductivity in 2020 and Arctic deliberately does not specify a value, because laboratory measurements of pastes usually fall between 1 and 4 for typical compounds. The one lab-measured figure Sunbeam cites is Thermal Grizzly Duronaut, at 6.433 plus or minus 0.078 under the ASTM D5470 method, from Igor’s Lab.

The practical lesson is to ignore the headline number on a package and to look at measured temperature differences in independent reviews. In those comparisons, the leading mainstream pastes, including Arctic MX-6, Noctua NT-H2 and Thermal Grizzly Kryonaut, finish within about one to two degrees of one another.

Best Overall Paste: Arctic MX-6

Arctic MX-6 is the paste most 2026 roundups name as the best choice for most users. It is non-conductive, non-corrosive and non-curing with a high viscosity, and it works across an operating range of -50 to 150 degrees Celsius. In one set of comparisons, MX-6, Kryonaut and NT-H2 formed the top three, about 1.4 to 1.7 degrees ahead of the rest. A listing from Arctic places its figure at about 7.5 watts per meter-kelvin, though as noted above, such numbers should be read with caution.

Who it suits: nearly everyone, from first-time builders to experienced users who want predictable results.

Pros: excellent performance for its tier, safe around motherboard components, no cure period, and the tube is generous for several applications.

Cons: its high viscosity makes it slightly harder to spread with a card, and formulations have been revised over time, so look for the current revision.

Best for Longevity: Noctua NT-H2

Noctua NT-H2 is a premium-tier paste with an operating range up to 200 degrees Celsius and a manufacturer claim of up to five years of useful life in a typical system. Tom’s Hardware lists it as the runner-up in the standard premium paste category, and it ships with cleaning wipes, which is handy for first-time builders. Performance is within a degree of MX-6 in the comparisons cited above.

Who it suits: builders who want to apply paste once and forget it for years, and anyone who likes an all-in-one kit.

Pros: long stated lifespan, included cleaning wipes, and a non-conductive formula.

Cons: costs more per gram than MX-6, and one comparison reported a poor sample from a 2024 batch, so buy from a reputable seller and check the batch if results look off.

Best Enthusiast Paste: Thermal Grizzly Kryonaut

Kryonaut has been the enthusiast default for years. Sunbeam calls it the paste for builders who want maximum performance without liquid metal. It is non-conductive, spreads easily and performs in the top group of mainstream compounds. Like all pastes, the quoted conductivity differs by website, with values from 6 to 14 seen in different listings, so go by measured reviews instead.

Who it suits: overclockers and enthusiasts who want the best non-metal result.

Pros: easy to apply, consistent results, trusted brand.

Cons: premium tier cost for gains of only a degree or two over cheaper options, and small tubes are used quickly.

Best Durable Paste: Thermal Grizzly Duronaut

Thermal Grizzly Duronaut is a Thermal Grizzly paste aimed at long-term use, and it is the only compound in the survey with a lab-measured conductivity of 6.433 W/mK. It is a sensible choice for systems you do not plan to open for years, and for processors that run hot and cycle often, which stress the paste.

Who it suits: owners of workstations and always-on machines.

Pros: published laboratory measurement, non-conductive, aimed at long service.

Cons: its performance in short comparisons is not clearly better than lighter pastes.

Best Budget Paste: Arctic MX-4

Arctic MX-4 is the older, widely sold sibling of MX-6. It remains a dependable low-tier option, with easy application, a non-conductive carbon-micro-particle formulation and a reputation for stable results. It is a sound pick for budget builds and for secondary machines, where saving a few degrees is not the priority.

Who it suits: budget builders and anyone repasting an older PC.

Pros: low cost, forgiving application, widely available.

Cons: a degree or two behind the newest premium pastes.

Best Pad: Honeywell PTM7950

Honeywell PTM7950 is a phase change pad. According to its manual, it has a conductivity of 8.5 W/mK, a phase change temperature of 45 degrees Celsius, a thermal resistance below 0.04 degrees Celsius square centimeter per watt, and thicknesses of 0.2, 0.25 and 0.5 mm. It stays solid at room temperature, softens when the processor warms it, and flows into the micro gaps. After 10 to 20 minutes of operation it activates, and performance settles after one to three heat cycles. Because the layer does not run or pump out, it is popular in laptops and handhelds, and in desktops where owners want a layer that does not dry out.

Who it suits: builders who value permanence and low maintenance, and laptop owners.

Pros: extremely long life, no pump-out, non-conductive, no mess.

Cons: it must be cut to size and applied carefully, many pads sold online come from third-party sellers and counterfeits are hard to spot, and it may not match the best pastes in a direct desktop swap.

Best Maximum Cooling: Thermal Grizzly Conductonaut Extreme

Conductonaut Extreme is a gallium-and-indium liquid metal that Thermal Grizzly describes as designed for maximum power density. It is silver with a density of 6.29 g/cm3 and an operating range of -50 to 200 degrees Celsius. A retailer describes it as giving roughly 18% higher conductivity than the standard Conductonaut, which is rated at 73 W/mK, though no official figure for the Extreme could be confirmed. It delivers the lowest temperatures of any option here, especially on high-power chips, but it comes with serious cautions.

Who it suits: experienced overclockers with nickel-plated copper cooler bases and a steady hand.

Pros: the best cooling available to consumers, significant gains on hot chips.

Cons: it is electrically conductive, so a spill on the motherboard can short components; it corrodes aluminum; it can leave stains on copper; and it requires careful masking and cleanup. Many manufacturers and case builders discourage it for general use.

Which TIM Should You Choose? A Decision Matrix

A Worked Calculation: What a Better TIM Really Buys

Suppose your processor dissipates 120 W and the thermal resistance across the paste layer is 0.10 degrees Celsius per watt with a mid-range paste. The temperature drop across the layer is 120 x 0.10 = 12 degrees. Switching to a paste that cuts the layer resistance by 15 percent to 0.085 degrees per watt lowers the drop to 10.2 degrees, saving 1.8 degrees. That matches the one-to-two-degree gaps reviewers record between the top pastes. Liquid metal might halve the layer resistance, saving around 6 degrees at the same power, which explains why overclockers consider it.

The saving shrinks at lower power. At 65 W, the same 15 percent improvement saves under 1 degree, which is within sensor noise. For a typical gaming chip drawing 60 to 120 W, a good mainstream paste is as much as most users will notice, and money is better spent on a bigger cooler or better case airflow.

How Long Does a TIM Last?

Paste does not suddenly fail, but it gradually thins, dries and pumps outward through repeated heating and cooling cycles. Typical advice is to replace standard paste every three to five years, with Noctua suggesting up to five for NT-H2. Phase change pads resist pump-out and may last the life of the machine, though the gap-filling layer can degrade after repeated disassembly. Liquid metal does not dry, but it can alloy with some metals, and repeated reseats require careful cleaning. Refresh the TIM whenever you remove the cooler, because the film is broken, and any time temperatures rise at an unchanged workload.

Does the Cooler Type or CPU Change the Choice?

The processor’s design affects how much a premium TIM can help. Chips with a soldered heat spreader, which includes current Ryzen and Intel desktop parts, already have an efficient path from die to spreader, so the TIM only has to bridge the spreader and the cooler. The layer between die and spreader is not something you can change without delidding, which voids guarantees on most chips and is outside the scope of a normal build. For this reason, the gap between a good paste and the best liquid metal on a stock soldered chip is modest, and the biggest gains show up when the chip draws well over 200 W.

Cooler construction also matters. Direct-touch heat pipe coolers have grooves between the pipes that a thin, medium-viscosity paste fills easily, while a polished flat copper cold plate on an all-in-one liquid cooler works best with a smooth, spreadable compound. Many AIO coolers arrive with a pre-applied pad or paste that is already well matched to the cold plate; if you reuse that cooler on a new chip, clean it fully and apply fresh paste in a single dot rather than layering over the factory material.

Applying Each Type Correctly

1. Pastes: clean both surfaces, apply a 3 to 4 mm dot in the center of a square spreader, lower the cooler straight down and tighten the screws in a cross pattern.
2. Phase change pads: cut the pad to the size of the spreader or die area, remove the protective film from one side, press it into place, remove the second film and mount the cooler. Run the system for 10 to 20 minutes to activate it, then expect final performance after one to three heat cycles, per the manufacturer’s manual.
3. Liquid metal: place a very small amount on the spreader and spread it with the supplied swab until the surface is evenly wet, then do the same on the cooler plate. Check for stray droplets before mounting, and mount without sliding.
4. After mounting: check idle and load temperatures in a monitoring tool and compare them with your earlier log. If a pad or liquid metal was used, re-check after a few days.

Whichever material you choose, document the date and the product in a note stored with the PC. When a temperature drift appears years later, knowing what is in the stack and how old it is saves guesswork.

TIM Versus Thermal Paste: Is There a Difference?

People use the terms interchangeably, but thermal paste is only one kind of TIM. The wider category also includes thermal pads, which are soft solid sheets used on memory and voltage regulators as well as on some processors, and phase change materials that behave as solids until warmed. When a guide says a processor TIM, it usually means the layer between the heat spreader and the cooler, but the same word also describes the layer under the spreader in the processor package itself. That inner layer is solder on most current desktop chips, and a polymer compound on some mobile and older parts, which is why delidding guides discuss it separately.

Choosing the right class first and the brand second keeps the decision simple. If you want the least risk, pick a non-conductive paste. If you want the least maintenance, pick a phase change pad. If you want the lowest temperatures and accept the risks, pick liquid metal. Within each class, the differences between reputable products are small enough that availability and fair cost can decide.

Safety and Cleanup Notes

• Clean with 90% or higher isopropyl alcohol and a lint-free cloth on both surfaces before reapplying.
• Keep liquid metal away from the socket area. Cover nearby surface-mount components with non-conductive lacquer or tape if you use it.
• Never use liquid metal on aluminum. It corrodes aluminum quickly. Check the cooler base material first.
• Wear gloves and avoid skin contact with any compound, and keep it away from children and pets.
• Verify pad authenticity. Third-party pads of unclear origin are common, so buy from a reputable seller.

Frequently Asked Questions

What is the best TIM for a CPU?

For most people it is a non-conductive paste like Arctic MX-6 or Noctua NT-H2, which sit in the top group of independent comparisons. Choose liquid metal only if you understand the risks, and consider a phase change pad for a permanent installation.

Is liquid metal worth it over thermal paste?

It lowers temperatures further, especially on high-power chips, but the gain at typical gaming power is small compared with the risk. A spill can destroy components, and it damages aluminum. For most builders a good paste is the better choice.

Do thermal conductivity numbers matter when buying paste?

Not much. The figures printed by sellers conflict from website to website, and manufacturers such as Thermal Grizzly and Arctic have stopped publishing them. Rely on independent measured temperature results instead.

How often should I replace my CPU TIM?

Every three to five years is typical for pastes, and sooner if temperatures drift upward. Replace it every time you remove the cooler. Phase change pads last longer but are also best renewed after a cooler removal.

Is the thermal paste that comes with a cooler good enough?

Pre-applied or bundled paste is usually adequate for a stock-cooled, mid-range processor. It is often thicker and less effective than premium pastes, so an upgrade can lower temperatures slightly and costs little.

Can I mix different thermal pastes?

Do not mix them. Clean the old paste off completely, then apply one product. Leftover layers of a different compound can trap air and reduce contact.