Short answer: the ARCTIC MX-4 4g is the best thermal paste for CPU builds in 2026. It is the only one in this list with a four-plus star average across a six-figure review count, it is metal-free and non-conductive, and the maker rates it to stay effective for at least eight years. If you want a premium enthusiast option, take the Thermal Grizzly Kryonaut. If you want the easiest install with wipes in the box, take the Noctua NT-H2.
Thermal paste, also called thermal compound, is a thin grease that sits between your CPU’s integrated heat spreader and your cooler’s base plate. A die and a cold plate are never perfectly flat, so microscopic air pockets form at the contact surface, and air is a terrible conductor. Paste fills those gaps so heat can actually flow into the cooler.
That matters more than most buyers assume. Poor contact makes the CPU run hotter, and sustained high temperatures trigger thermal throttling, where the processor deliberately drops its clock speed to stay inside safe limits. The compound you choose also decides how many years pass before you have to strip the cooler down again.
We pulled ten non-conductive compounds together, read the review data on each, and cross-checked the chatter on r/pcmasterrace, Linustechtips, Overclockers, TechPowerUp and Techenclave. This is a CPU guide, so GPU-focused compounds get a mention where they matter, and the phase-change and liquid metal options get their own section further down. If you are also shopping the rest of the cooling stack, our case fan kit guide and GPU thermal paste guide cover the parts that sit next to the CPU block.
Table of Contents
Top 3 Picks for CPU Builds in 2026
ARCTIC MX-4 4g
- Carbon microparticle formula
- Metal-free and non-conductive
- Rated to last at least 8 years
Thermal Grizzly Kryonaut
- Non-curing formula
- Stable at up to 80C
- Syringe and spatula included
All 10 Best Compounds at a Glance (October 2026)
Every paste below is electrically non-conductive, which is what we want for a socketed desktop CPU. The differences between them are smaller than the marketing suggests, so read the table for the deciding factor, not the headline.
| Product | Specs | Action |
|---|---|---|
| ARCTIC MX-4 4g |
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Check Latest Price |
| Thermal Grizzly Kryonaut 1g |
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| Noctua NT-H1 3.5g |
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 Corsair TM30 3g |
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 ARCTIC MX-6 4g |
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 Noctua NT-H2 3.5g |
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 ARCTIC MX-7 8g |
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 Corsair XTM70 3g |
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 Thermal Grizzly Kryonaut Extreme 2g |
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 Gelid Solutions GC-4 3.5g |
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Does Thermal Paste Even Matter? Delta Over Ambient in Plain English
Before the list, one calibration that saves a lot of arguments. Test labs report results as delta over ambient, meaning how many degrees above the room temperature your CPU sits under a fixed load. Two pastes sitting three degrees apart in that chart behave almost identically in a normal build.
You will see this scale in real builder testing. An Overclockers forum contributor who tested a range of pastes reported NT-H1 as the lowest performer in their set and Kryonaut as the best, with a spread of only about 3.3% delta over ambient between the two. That is the entire gap between a mid paste and an enthusiast paste on a well-mounted cooler.
So how much does the choice matter? It matters enormously if you are replacing dried-out paste from a five-year-old machine, where owners regularly report drops of 15 to 20C. It matters a little if you are swapping a good non-conductive paste for another good non-conductive paste. It matters most of all for how long the install lasts and whether you risk a short circuit.
Builds throttle well before the difference between pastes becomes the deciding factor. If your CPU is already sitting near its thermal limit with a well-known paste, the fix is airflow, a better cooler, case airflow, or a dust filter that has not been cleaned in a year. Forum regulars pair their annual repaste with a case clean and filter wash for exactly this reason.
1. ARCTIC MX-4 4g – The Best Overall Thermal Paste for CPU Builds
ARCTIC MX-4 (4 g) – Premium Performance Thermal Paste for All Processors
4g tube
Metal-free and non-conductive
Rated to last at least 8 years
Best sellers rank #2
Pros
- Consistent formula across 105k+ reviews
- Easy to apply even for beginners
- Metal-free so no short-circuit risk
- 4g covers many applications
Cons
- Slight learning curve for first-time applicators
- Not an extreme-overclocking compound
This is the one I put in every build that is not specifically chasing an overclock. Over 105,000 reviews averaging 4.8 stars is a sample size nothing else in the category comes close to, and the complaints that do appear are about application technique rather than cooling results.
The formula is built from carbon microparticles, which is why it stays put under a heavy tower cooler and why it does not creep toward the edges of the spreader over time. It is metal-free, so a stray smear on a socket or a capacitor cannot short anything out. That matters if you are nervous, and it matters even more if a future repaste happens without the board out of the case.
What owners actually report is a 2 to 3C improvement over Noctua NT-H1 in side-by-side comparisons, plus long-term stability with no drying or migration reported after years. Several reviewers note that the formula itself has not changed even as the packaging has been refreshed, which is the point: you are buying the same compound that built the review base.
The one caveat worth naming is the learning curve. If this is your first time applying compound, the consistency is forgiving but the amount still matters, and a first-timer tends to use too much. Warm the tube in your hands for a few seconds before you squeeze it out. That single habit removes most of the frustration people report.
What to check before you buy
Confirm you are getting the 4g tube and not a smaller refill or a multipack, because the 4g size is the one that covers repeated builds. It sits in the Thermal Paste and Pads category at number two, so it is easy to find and easy to compare against the alternatives on this page.
Worth knowing: the 4g tube is a genuine long-term supply. For most builders it is enough for a CPU install, a repaste in a couple of years, and a graphics card job as well.
Where it is the wrong choice
If you are running a heavily overclocked chip at 80C or above for hours, this is a non-curing, mid-viscosity compound and there are thicker options built specifically to resist pump-out under those conditions. You would be giving up a small amount of performance for a large gain in mechanical stability.
It is also the wrong tool for a bare laptop die or a console module where the mounting pressure is very low and a thin compound can pump out. For those jobs, the MX-6 or MX-7 entries below fit the brief better.
2. Thermal Grizzly Kryonaut 1g – Premium Paste for Enthusiast Builds
Thermal Grizzly Kryonaut – 1 Gram Thermal Paste Extremely High Performance
1g syringe
Syringe and spatula included
Does not dry out at 80C
Universal socket fit
Pros
- Exceptional thermal conductivity for overclocking
- Works immediately with no break-in
- Supplied spatula gives precise control
- Stable at high die temperatures
Cons
- Thin consistency can pump out on direct-die surfaces
- 1g tube is small for large IHS chips
- Harder to spread than thicker pastes
Kryonaut is the enthusiast reference point in this category, and it is the paste an Overclockers contributor rated best in the range they tested. Owners on desktop CPUs report 5 to 12C improvements over whatever was there before, and the formula is non-curing, so there is no burn-in period where you wonder whether it is working.
The package is the part we like most for a first install. You get a syringe and a matching spatula, which means you can lay an even film or a controlled line instead of guessing with a fingertip. The compound is rated to stay stable and not dry out even at 80C, which matters if you are an overclocker holding peak load.
The dry-out question comes up constantly with this name, and the honest answer is that the complaint is about a year of neglect, not about the compound. Reviewers who left it longer than that report stable performance, and the forum consensus in that thread was to repaste annually and clean the case and filter at the same time.
It is a thin, watery formula by modern standards. On a CPU with a flat integrated heat spreader and a solid mounting spring, that is a strength. On a bare GPU die where expansion is extreme, owners report degradation over months from pump-out, so this is not the tube I would use on a graphics card.
What to check before you buy
The 1g syringe size is the honest catch. On a large IHS chip like LGA1700, reviewers frequently suggest buying more than one tube, because a single syringe is a tight budget for a full mount plus a touch-up. Check the included component list: you get the syringe and applicator, not a pack of wipes.
Also note the listed cooler material is aluminum and the socket fit is universal, so it works with anything you are likely to bolt it to. There is no pairing or compatibility check needed.
Where it is the wrong choice
If your CPU has a direct-die contact surface, an offset laptop die, or a very light mounting force, a thin non-curing compound is exactly the profile that pumps out. Take a thicker paste instead.
Second, if you are the type who repaints or cleans the board rather than replacing parts, this thin formula is stubborn to clean out of a socket. A thicker compound lifts out more cleanly with an alcohol wipe.
3. Noctua NT-H1 3.5g – The Best Value Non-Conductive Paste
Noctua NT-H1 3.5g, High-Performance Thermal Paste
3.5g pack
Cleans with a dry paper towel
3 to 20 applications
Up to 5 years CPU use
Pros
- Decades of proven use
- No spreading required before mounting
- Cleans up without alcohol
- Generous for the size of the pack
Cons
- Costs more per gram than generic tubes
- Performance is not at the top of the category
NT-H1 has been on shelves since the era when most people bought a tower cooler and never thought about the compound again. That longevity is the review base: 32,000 ratings at 4.8 stars, spread across a very long time period rather than a launch-week spike.
What makes it a value pick is the combination of the 3.5g pack and the cleanup story. It needs no spreading before the heatsink goes on, and it wipes off with a dry paper towel instead of demanding alcohol and lint-free wipes. For a builder doing three installs, that adds up.
On performance, reviewers consistently place it within about a degree of other premium non-conductive pastes. In the personal test set reported on Overclockers, it came out at the bottom of a group of good pastes, but the entire spread across that group was about 3.3% delta over ambient. A commenter on a gaming-laptop thread put it more bluntly, calling NT-H1 a mediocre performer after moving to MX-6.
Both of those framings are fair, and neither changes the recommendation for most builds. If you are chasing the last two degrees on a hot chip, look higher on this list. If you want to mount a cooler once and forget about it, this is the tube.
What to check before you buy
The pack is sized for roughly three to twenty applications depending on your CPU, so a single 3.5g tube comfortably covers a build plus a future repaste. It also works for air coolers, AIOs, GPUs, consoles, and laptops according to the manufacturer.
Stock-keeping is generous here: recommended storage up to three years and recommended usage on a CPU up to five years. That is the longest published service interval on this list, and it is the number to plan your repaste schedule around.
Where it is the wrong choice
There is a gamer-tier comment in the forum record that buyers care about the street price of premium tubes, and NT-H1 costs more per gram than a generic alternative. If your build is a strict budget project, the Corsair TM30 further down does the same job for less.
It is also not the paste for a direct-die or heavily offset surface, where a thicker, higher-cohesion compound holds its shape better through repeated thermal cycles.
4. Corsair TM30 3g – Most Versatile With a Spreader in the Box
Corsair TM30 Performance Thermal Paste | Ultra-Low Thermal Impedance CPU/GPU | 3 Grams|w/applicator, Silver for Desktop
3g pack
Zinc oxide based
Includes stencil and spreader
2 year warranty
Pros
- Included stencil and spreader
- Non-conductive with no volatile compounds
- Low viscosity fills fine scratches
- Resists drying and cracking
Cons
- Listing copy still references the older XTM50 name
- Not aimed at extreme overclocking envelopes
TM30 solves a problem most buyers do not know they have: they do not own a spreader. The package includes an application stencil and a spreader, so a full even film is one extra step rather than an excuse to put the cooler on immediately.
The compound itself is a zinc oxide based liquid with low viscosity, which reviewers credit for filling the microscopic abrasions and channels that exist on any used cold plate. Owners report noticeable improvements when replacing aged or factory paste, and no drying over multi-year use.
It is also explicitly non-conductive with zero volatile compounds, so it is safe on a board that is not fully out of the case. That is the same safety argument that carries the MX-4 and MX-6, and it is why liquid metal never appears in our top three.
One practical note: the feature bullet copy on the listing still references the older XTM50 product name. That is a copy-paste leftover on an otherwise well-reviewed tube, not a different formula or a different product in the box.
What to check before you buy
Make sure the listing you order is the desktop TM30 with the applicator kit. The 3g pack with the stencil and spreader is the version that solves the tooling problem, and the included components list confirms the applicator ships with it.
Also worth noting: there is a two-year warranty on this one, which is more paperwork than most compound listings carry. It is a low-viscosity paste meant for spreading, so do not blob it in the centre and expect it to flow under a light mounting force.
Where it is the wrong choice
If you are chasing maximum performance on a 250W-class chip running a heavy overclock, there are compounds on this list positioned for that envelope and this is not one of them. Reviewers describe it as a strong everyday performer, not a limit-chasing one.
It is also the wrong choice for a bare die with very low mounting pressure, where a spreadable low-viscosity liquid is more likely to pump out than a high-cohesion paste.
5. ARCTIC MX-6 4g – The One to Buy for Graphics Cards and Consoles
ARCTIC MX-6 (4 g) – Ultimate Performance Thermal Paste for CPU, Consoles, Graphics Cards, laptops, Very high Thermal Conductivity, Long Durability, Non-Conductive
4g tube
Thick high-viscosity formula
Neither conductive nor capacitive
About 20 percent better than MX-4
Pros
- Thicker paste stays where it is placed
- Suited to direct-die and console surfaces
- No curing or break-in needed
- Double-digit drops reported versus factory paste
Cons
- Thick and sticky consistency is hard to spread
- No spreader included in the tube
- Gains over a good existing paste are modest
MX-6 is the paste we would reach for if the job is not a CPU. The manufacturer states it is suitable for direct-die cooling on graphics cards and console processors specifically because of its viscosity, and that is the mechanical property that matters on a surface with no integrated heat spreader to hold a uniform film.
On processors it is also excellent, and the maker rates it at about 20 percent better performance than the MX-4 with measurably lower thermal resistance. In practice, review data puts the real gain over an already-good paste in modest territory, which is the honest way to read that number.
Forum sentiment has moved toward MX-6 as the current-generation value pick. A gamer-tier user on a Techenclave deal thread described the 4g version as pretty good, which is a low bar that a lot of pastes clear, and casual builder opinion has largely displaced the MX-4 as the default recommendation.
Application is the real friction. Reviewers repeatedly flag that the thick, sticky consistency is difficult to spread straight from the tube, and several suggest warming the tube in your hand first. It also does not include a spreader, unlike the TM30.
What to check before you buy
Check the pack size. The 4g tube is the standard single unit, and the manufacturer also offers a two-pack if you are covering a CPU and a graphics card from the same tube. The grey colour and the ACTCP00080A part number identify this version.
ARCTIC also runs an authenticity check on individual units, which matters more than usual in this category because marketplace listings for this brand are frequently inflated.
Where it is the wrong choice
If you are a beginner mounting your first tower cooler, this is a harder first experience than the MX-4 or the NT-H1. The thickness that makes it great on a bare die makes it awkward on an IHS with a light spring.
It is also the wrong pick if you are already running a good non-conductive paste and hoping for a big number. Reviewers consistently describe the improvement over MX-4 as modest, and a Linustechtips reply captures the general mood by advising people to use the compound that shipped with their cooler and stop overthinking it.
6. Noctua NT-H2 3.5g – The Easiest Install With Wipes in the Box
Noctua NT-H2 3.5g, High-Performance Thermal Paste and 3 Cleaning Wipes
3.5g pack
Three NA-CW1 wipes included
Spreads under mounting pressure
Up to 5 years CPU use
Pros
- Second generation formula
- No spreading needed before mounting
- Wipes included for old-compound removal
- Quiet fans reported after repasting
Cons
- Costs more per gram than most rivals
- Modest gains over a good existing paste
- Included wipes are oversized
NT-H2 is the version of the NT-H1 idea that fixes the one thing people actually asked about: cleaning. Three NA-CW1 wipes are in the box, which is enough to strip old compound off an IHS and a cold plate without you needing to buy anything else.
On results, reviewers consistently place it within a degree or two of Kryonaut while giving you more paste and the wipes, and they call it the better value of the two. That matches what we saw in the personal test data: the gap between the best and the worst non-conductive pastes in a good set is small, so the extras are what decide it.
Several owners who repasted with NT-H2 report a visible drop in CPU temperatures and noticeably quieter fans, because the fan curve can be tightened once the package is cooler. The compound spreads evenly under mounting pressure, so you do not spread it first, and it is non-conductive with up to five years of recommended CPU use.
User tests put the improvement at roughly 4 to 6C against older pastes. Against a fresh, good non-conductive paste, expect much less than that.
What to check before you buy
Confirm you are getting the 3.5g pack, and check the wipe count on the listing, because the wipes are the reason to pick this over the NT-H1. The pack covers roughly 3 to 20 applications depending on CPU size, so one tube is plenty for a build and a repaste.
It lists for air and liquid coolers, so an AIO cold plate is a supported surface. That matters because AIO mounting pressure is often lower than a tower’s spring, and a paste that spreads under pressure is exactly what you want there.
Where it is the wrong choice
It is not the cheapest way to cover a surface, and buyers who count cost per gram rather than cost per install should compare it with the value entries. The three included wipes are also described by reviewers as oversized for the job, so do not plan on them covering an entire AIO loop.
For bare dies and offset surfaces, look for a high-cohesion compound rather than a spreading one. This paste is built to be pushed flat by a mounting spring.
7. ARCTIC MX-7 8g – The Thickest Option for Pump-Out Resistance
ARCTIC MX-7 (8 g) – Ultimate Performance Thermal Paste, Long Durability
8g tube
Dense highly viscous formula
Dot or X pattern only
Electronically non-conductive
Pros
- High filler content for strong heat transfer
- High cohesion resists pump-out and dry-out
- Works across CPUs
- GPUs
- laptops and consoles
- 8g covers many applications
Cons
- Cannot be spread by design
- Very viscous so warm the tube first
- Spreads poorly on bare dies without a line or dot
MX-7 is the answer to the single most common long-term complaint in this category: paste that pumps out. The formula is dense, highly viscous, and loaded with filler, and the manufacturer states outright that the high cohesion prevents pump-out, dry-out, or bleeding through repeated thermal cycles.
Users report larger idle and load temperature drops than the MX-4 and MX-6, and reviewers single it out for laptops, graphics cards, and both air and liquid cooled CPUs. It is also electrically non-conductive and non-capacitive, so it shares the safety profile of everything else on this list.
The catch is that the application method is deliberate. This paste cannot be spread manually by design; the low adhesion is meant to let it distribute naturally under cooler pressure without trapping air bubbles. You apply a dot or an X pattern and mount the cooler.
Because it is very viscous, reviewers recommend warming the tube before application. And on bare direct-die surfaces, it does not spread well without a line or a dot, so plan the pattern before you open the tube.
What to check before you buy
The 8g tube is unusually large for a single-ingredient purchase, and it is listed for desktops, consoles, graphics cards, and laptops. That makes it the one to buy if you service several machines or plan to repaste a laptop and a desktop from the same supply.
Longer-term durability data is thinner here than for the older formulas simply because the product is newer. Judge it on the pump-out resistance claim and the reported temperature results, not on a multi-year track record.
Where it is the wrong choice
If you want to spread a controlled even film, this is the wrong tube. The manufacturer designed it not to spread, so the small-pad method is the only one that works cleanly.
It is also the wrong pick for a first build where you want visual confirmation that the compound is covering the die. With a dot pattern you have to trust the mount, and the result is not visible until you take the cooler off again.
8. Corsair XTM70 3g – Built for 250W and Above
Corsair XTM70 Extreme Performance Thermal Paste, 3g for Intel & AMD Processors up to 250W+ TDP – Low Viscosity, Easy Application, Three Included Cleaning Wipes and Applicator Kit for Desktop
3g pack
Targets processors to 250W and above
Applicator kit plus three wipes
Low viscosity
Pros
- Low viscosity spreads evenly and cleanly
- Targets 250W and higher processors
- Full applicator kit and three wipes included
- 15 to 20C drops reported over eight-year-old paste
Cons
- Higher cost per gram than rivals
- Gain is modest against good modern paste
- One buyer received a partially depleted unit
XTM70 is the only paste here with a stated processor target rather than a general-purpose claim: Intel and AMD parts up to 250W TDP and beyond. If you are running a top-bin Ryzen 9 or a Core Ultra at full boost for hours, that is the specification to match your build against.
The application kit is thorough. Low viscosity spreads evenly and cleanly, and three cleaning wipes handle the old compound, so nothing extra needs buying. Owners replacing eight-year-old paste report 15 to 20C drops, which is what a genuinely degraded interface produces.
Against a modern, good-quality paste the picture is much flatter. Reviewers put the improvement at around a degree or so, and a recurring sentiment is that the temperature gain does not justify the cost compared with cheaper high-performance pastes.
The listed material type is copper-based, which is worth noting only in the sense that it behaves like a conventional paste: non-curing, non-conductive, and a straightforward compound rather than a metal alloy.
What to check before you buy
Check that your CPU actually falls in the stated envelope before paying for the premium. If you are on a mainstream 65W or 105W part, this tube does nothing that the value entries do not.
One reviewer reported receiving a partially depleted unit with less paste than the stated 3g, so inspect the tube on arrival. Everything else in the package is the applicator kit and the wipes.
Where it is the wrong choice
It is the wrong choice for a budget or mainstream build, where the money is better spent on the cooler. A degree of improvement over a good paste is not where build budgets should go.
It is also not an extreme-overclocking compound in the way liquid metal is. If you are chasing an all-core overclock ceiling, the number to beat is not this tube.
9. Thermal Grizzly Kryonaut Extreme 2g – The Complete Kit
Thermal Grizzly Kryonaut Extreme – 2 Gram – Extremely High Performance Thermal Paste with 12 Cleaning Wipes 6 Wet & 6 Dry- for Maximum Thermal Conductivity While Overclocking CPU/GPU/PS4/PS5/Xbox
2g syringe
Six wet and six dry wipes
Syringe and applicator included
Non-curing formula
Pros
- Nano aluminum oxide filler reaches fine irregularities
- Non-curing and stable at up to 80C
- Twelve wipes plus applicator in the box
- 5 to 20C drops reported against factory paste
Cons
- Higher cost per gram than most alternatives
- 2g tube is small for multi-surface work
- Some users replace it sooner than thicker pastes
This is the enthusiast version of the Kryonaut formula, and the difference in the box is the reason to consider it. You get a syringe, a dedicated applicator, and a full cleaning kit of six wet and six dry wipes, which is more than enough to strip and rebuild a mount several times over.
The filler is nano aluminum oxide, which the manufacturer says fills the smallest surface irregularities, and the formula is non-curing and stable up to 80C. Reviewers report 5 to 20C temperature drops against factory or previous paste, and many note it edges out the original Kryonaut.
What it has not got yet is a long-term track record. With a few hundred reviews, we are reading early owner reports rather than a decade of field data, and the sample is not large enough to treat as settled. The bundled wipes and applicator are singled out repeatedly as the useful part.
Some users also report needing to replace it sooner than they would a thicker paste, which is the mirror image of the pump-out story on the MX-7. The dominant complaint is simply cost per gram.
What to check before you buy
Work out how many surfaces you need to cover before you pick a 2g tube. Reviewers who repaste several surfaces in one session flag the size as small, and the twelve included wipes are what make the small tube manageable rather than frustrating.
The package dimensions are modest and it is a straightforward box-and-syringe format with no pairing or compatibility to verify. It covers CPUs, GPUs, and current consoles according to the manufacturer.
Where it is the wrong choice
If you only need one install on one CPU, the wipes and applicator are nice but not decisive, and a value tube gets you within a degree or two. The premium here buys the last small increment and the tooling.
It is also the wrong pick for a bare die or an offset laptop surface if your priority is longevity, given the reports of shorter service intervals than thicker compounds.
10. Gelid Solutions GC-4 3.5g – The Value Pick for Big Temperature Drops
Gelid Solutions GC-4-3.5g Thermal Compound for Heat Sinks | Maximum Thermal Conductivity | Easy to use | Non-Corrosive
3.5g pack
Micron-particle synthetic filler
Non-curing and non-corrosive
Stable from -30C to 150C
Pros
- Reported 82C to 75C drop on an overclocked Ryzen 5 5700G
- Handles direct GPU die contact well
- Spreads well for the price
- Generous volume for a 3.5g pack
Cons
- Several owners report pump-out over time
- Limited benefit reported on some laptop CPUs
- Small review base
GC-4 is the value wildcard on this list, and the numbers its owners report are better than the tier suggests. One reviewer replacing the previous compound on an overclocked Ryzen 5 5700G saw it drop from 82C to 75C, which is a real step rather than noise.
Where it earns its place specifically is direct GPU die contact, where many cheap pastes struggle with the flatness of a bare die. The formula uses micron-particle synthetic filler in a polymer matrix, is non-curing, and is rated stable from -30C to 150C.
What to check before you buy
The 3.5g pack is one of three sizes, alongside 1g and 10g versions, and it is the one most buyers want. Reviewers consistently comment that the volume is generous for the amount of compound provided.
It is also one of the few pastes here listed as non-corrosive, which matters if you are mounting to a plated cold plate and you want to avoid any long-term chemical concern with the plating.
Where it is the wrong choice
The durability criticism is consistent enough to plan around. A number of owners report pump-out after extended use and prefer a more viscous compound for a permanent install, which makes this better suited to periodic refreshes than to a machine you will never reopen.
Owners also report limited benefit on some laptop CPUs, with the gains showing up mainly on the GPU side. And with a small review base, treat the headline temperature drops as one machine rather than a general result.
MX-4 vs MX-6: Which Arctic Paste Should You Buy?
Buy the MX-6 for a graphics card, a console, or a laptop with an exposed die. Buy the MX-4 for a CPU. The manufacturer rates MX-6 at about 20 percent better performance with lower thermal resistance, but the two pastes are built for different mounting conditions, and that difference matters more than the number.
MX-6 is thick and high-viscosity on purpose. That consistency stays where it is placed, which is why the manufacturer calls it suitable for direct-die cooling on GPUs and console processors. On an integrated heat spreader with a proper mounting spring, that same thickness just makes it harder to spread evenly, and reviewers repeatedly tell beginners to warm the tube in their hands first.
MX-4 is thinner, spreads easily, is rated to stay effective for at least eight years once applied, and has a six-figure review base. It is simply the safer default for a first socketed CPU build.
On longevity specifically, MX-4 has the stronger published claim, while MX-6 has the stronger viscosity behaviour. On application difficulty, MX-4 wins clearly. If you are upgrading a system that already has MX-4, the gain from moving to MX-6 will be modest, so keep what you have.
Beyond Paste: Liquid Metal and Phase-Change Sheets
Two categories sit outside the ten above, and both appear constantly in the search results, so it is worth being clear about where they fit. Neither one is a thermal paste in the conventional sense.
Liquid metal is a gallium-based alloy with a conductivity figure several times higher than any conventional compound. The top answer on the r/pcmasterrace thread that ranks first for this head term recommends it outright, and that is real community consensus rather than marketing. The same thread pairs that recommendation with a routine of repasting and cleaning the case and filter every year.
Here is the warning that needs to be stated plainly, because forum posts too often skip it. Liquid metal is electrically conductive and must never touch CPU pins, the socket, or any motherboard circuitry. It also reacts with aluminum, so it is a copper-and-nickel-only material, and many budget coolers and AIO cold plates are aluminum or aluminum-plated. It is genuinely hard to clean, and you should never use a vacuum to lift old compound because of the sharp fragments it can produce. For a first build, this is not the product to learn on.
Phase-change sheets, of which PTM7950 is the best known example, are solid sheets that soften into place when the die heats up and re-solidify when it cools. Several comparators are drawn in this niche because the sheet is not pumped out by thermal cycling the way paste can be, and laptop owners increasingly name it as a default recommendation for bare laptop dies. KryoSheet is the competing product, and the two are usually discussed as equals, so the choice between them comes down to which one you can get hold of.
Is PTM7950 better than liquid metal? Not in raw conductivity, where liquid metal is ahead by a wide margin. It is easier to handle, it is not electrically hazardous in the same way, and it is mechanically more stable across cycles, which is why the two are rarely compared on a single number. If you are comfortable with liquid metal and have a copper cold plate, it will still transfer more heat. If you are not, a phase-change sheet gives you most of the practical benefit at none of the risk.
Can you replace liquid metal with thermal paste? Yes, and most builders do. You will give up some peak performance and you will need to clean the copper plate properly first, since leftover metal is stubborn. In exchange you get a non-conductive, forgiving, easy-to-replace interface.
How to Apply Thermal Paste Without Overdoing It
Over-application is the most common self-inflicted mistake, and it is worth addressing head-on, because plenty of people ruin a perfectly good compound with a syringe. One highly upvoted forum reply puts it plainly: liquid metal is not going to solve your issue, can pump out too, and you are over applying the paste.
Can too much thermal paste damage a CPU? It can reduce cooling performance, squeeze the compound out toward the edges, and make a mess that has to be cleaned before you can remount. It will not destroy a processor. The failure mode is hotter temperatures, not a dead chip.
Clean both surfaces first. Wipe the integrated heat spreader and the cold plate with alcohol or the included wipes, then let them dry fully. Old compound left in place is the reason people measure no improvement from a new paste.
Pick a method and commit to it. A pea-sized dot in the centre is right for a modern IHS with a firm mounting spring. A thin line across the length suits a larger surface. A full spread suits a small die or a surface with no IHS at all, and the TM30 ships the spreader for exactly this.
Do not use both. A dot plus a line is a common over-application. Choose one.
For pastes that cannot be spread, use a dot or an X pattern. The MX-7 is designed this way and distributes itself under mounting pressure.
Mount without twisting. Lower the cooler straight down, tighten in a cross pattern, and let the spring do the work. Sliding the cooler sideways after contact pumps the compound out of the interface.
Check your temps before you close the case. Boot into your BIOS, watch the idle package temperature, and compare it against what the same machine idled at before.
On the amount question, the honest answer is that there is no universal rule, only cooler-dependent guidance. A heavy tower with a strong spring needs very little. A thin AIO mounting plate or a laptop heat module needs a careful, even layer. When in doubt, a pea-sized dot on a socketed CPU is the safest bet on this list.
For laptops and consoles specifically, our graphics card paste guide covers the direct-die differences, and if you are also planning a compact system, our Mini-ITX CPU picks are matched to the same constrained-airflow reality.
How to Choose Thermal Paste for Your Build
Non-conductive versus electrically conductive is the first decision, and for a CPU it is not a close one. Every paste in this roundup is metal-free or non-conductive, which removes the short-circuit risk entirely. Conductive compounds exist and they are used in bare-die laptop and console work, but on a socketed desktop the risk of a smear on a socket or a capacitor outweighs any benefit. If you are nervous about it, stay non-conductive.
Match viscosity to the surface. A thin, easily spread compound suits a CPU with an integrated heat spreader and a firm mounting spring. A thick, high-cohesion compound suits a bare die, a console module, or any build where the mounting force is low. That is the real reason MX-6 and MX-7 exist alongside the spreadable pastes.
Think about mounting pressure, because it changes the answer. A heavy air tower with a strong spring pushes the compound into a thin, uniform film and rewards low viscosity. A basic push-pin cooler, a laptop heat module, or a slim AIO applies far less force, so it needs more material and more cohesion. Direct-touch heat pipe designs deserve extra care, because a narrow contact on a wide heat pipe concentrates pressure unevenly and can spread compound away from the die.
Look at the service interval, not the wattage number on the front. Noctua publishes recommended CPU usage times of up to five years for both NT-H1 and NT-H2. ARCTIC states the MX-4 stays effective for at least eight years once applied. Kryonaut is non-curing and stable at up to 80C. For budget compounds, the honest answer is that you should expect to refresh them sooner.
A rule of thumb that circulates in the forums is a 6 to 8 percent rise in delta over ambient as the signal to repaste. Treat that as a prompt to check, not a law. The more reliable trigger is behaviour: fans running higher than they used to, temperatures creeping up under the same workload, or a machine that has been on two or more years without a clean.
Watch out for inflated marketplace listings. This category is heavily concentrated on Arctic and Thermal Grizzly listings, and third-party sellers routinely run those SKUs well above the going street level. Before you buy any of the pastes on this page, check the listing is sold by the brand or an authorised retailer rather than a random marketplace name. It is the one place in this guide where you can pay double for the identical tube in the identical box.
Do not throw away the paste that came in the box. It is applied at the factory, it is a legitimate thermal interface material, and a Linustechtips reply recommends simply using the compound that shipped with the cooler. If you are reusing a boxed cooler on a new CPU, the factory bead is perfectly usable. You only need to repaste when you are opening the cooler anyway, or when temperatures are climbing for another reason.
Finally, learn to tell whether you are actually throttling. Check your maximum clock against the boost clock under load, watch whether clocks drop when the package temperature approaches its limit, and compare idle temperatures before and after a case clean. If your CPU is not hitting its thermal limit, the paste is not the problem. Most of the large reported temperature drops on this page come from replacing genuinely dried compound or from fixing airflow, not from a better formula.
If you are still working through the rest of the build, our AM5 accessory guide covers the surrounding platform parts, and the micro-ATX case roundup goes into airflow, which does more for your temperatures than any compound on this page.
Frequently Asked Questions
Is MX-4 or MX-6 better?
Buy the MX-6 for a graphics card, a console, or a laptop with an exposed die. Buy the MX-4 for a CPU. MX-6 is thicker and high-viscosity so it stays where it is placed, which is why the manufacturer calls it suitable for direct-die surfaces, while the MX-4 spreads easily and is rated to stay effective for at least eight years. The stated 20 percent performance gain over the MX-4 is real on paper, but reviewers describe the improvement in everyday use as modest.
Is PTM7950 better than liquid metal?
Not in raw thermal conductivity, where liquid metal is ahead by a wide margin. PTM7950 is easier to handle, is not electrically hazardous in the same way, and does not pump out through repeated thermal cycles. If you are comfortable with liquid metal and have a copper cold plate, it will still transfer more heat. If you are not, a phase-change sheet gives you most of the practical benefit at none of the risk.
Can too much thermal paste damage a CPU?
It cannot destroy a processor. Too much paste squeezes the compound out toward the edges of the spreader, traps air, and reduces cooling performance, and it makes a mess you have to clean before remounting. Use a pea-sized dot in the centre for a modern integrated heat spreader with a firm mounting spring, or a thin line, but never both.
What is the best non-conductive thermal paste?
For most CPU builds, the ARCTIC MX-4. It is metal-free, electrically non-conductive, rated to stay effective for at least eight years, and carries a six-figure review count. The Thermal Grizzly Kryonaut is the enthusiast option and the Noctua NT-H2 is the easiest to install, but all three sit within a few degrees of each other on a well-mounted cooler.
How much amount of thermal paste to apply?
A pea-sized dot in the centre for a modern CPU with an integrated heat spreader and a firm mounting spring. Use a thin line for a larger surface, and a full even spread for a small bare die. On low-pressure mounts such as laptop modules or thin AIO plates, use more than you think and spread it evenly. Never combine a dot and a line.
Can I replace liquid metal with thermal paste?
Yes, and most builders do. You will give up some peak performance and you need to clean the copper cold plate properly first, because leftover metal is stubborn to remove. In exchange you get a non-conductive, forgiving, easy-to-replace interface that carries no short-circuit risk and no aluminum compatibility problem.
The Verdict for CPU Builds in 2026
The ARCTIC MX-4 4g is the best thermal paste for CPU builds in 2026, and the reason is durability rather than a headline temperature number. The best thermal paste for CPU builds is rarely the fastest one, and it is almost never the one that requires the most care.
Take the Thermal Grizzly Kryonaut if you are overclocking or want the enthusiast formula and the supplied spatula. Take the Noctua NT-H2 if you want the cleaning wipes in the box and the easiest install of the lot. Take the ARCTIC MX-6 if a graphics card or a console is part of the job. Take the Corsair TM30 on a tight budget, and the ARCTIC MX-7 when pump-out across repeated thermal cycles is your main worry.
Whatever you choose, apply a pea-sized dot, mount without twisting, and check your temperatures before the case goes on. That habit will do more for your CPU than any difference between the compounds on this page.