For most PC builders, the ARCTIC MX-4 in the 4 g tube is the best thermal paste for a CPU: it is non-conductive, forgiving to apply, and the tube holds enough compound for many re-pastes. Overclockers and anyone chasing the last few degrees on a high-wattage chip should look at Thermal Grizzly Kryonaut, while ARCTIC MX-7 suits builders who want the newest formulation and a large 8 g supply. Thermal paste is the thin layer that fills microscopic gaps between the processor’s metal lid and the cooler’s cold plate so heat can move across instead of sitting behind trapped air.
Our Top Picks
Top 3 picks at a glance
Quick List
- ARCTIC MX-4 (4 g) – best for first builds and everyday re-pastes
- Thermal Paste CPU 1.8g with Toolkit – best for occasional repairs where a bundled toolkit matters more than brand
- Thermal Grizzly Kryonaut with cleaning wipes – best for a clean, complete re-paste of a hot CPU
- Thermal Grizzly Kryonaut (1 g) – best for a single high-performance application
- ARCTIC MX-7 (8 g) – best for long-term supply and the newest ARCTIC formula
- ARCTIC MX-4 with spatula (4 g) – best for beginners who want the tools in the box
Which One Is Right for You?
| If you… | Choose |
|---|---|
| are building your first PC and want a safe, proven default | ARCTIC MX-4 (4 g) |
| push a high-core-count CPU hard and care about every degree | Thermal Grizzly Kryonaut with wipes |
| paste a lot of machines or keep a spare tube for friends’ builds | ARCTIC MX-7 (8 g) |
| need one clean application and nothing else | Thermal Grizzly Kryonaut (1 g) |
| want a spreader tool packed with the tube | ARCTIC MX-4 with spatula |
| need a small toolkit-style kit for a one-off fix and accept an unfamiliar brand | Thermal Paste CPU 1.8g with Toolkit |
If you are unsure, start with the 4 g MX-4 and keep it for the life of the build. Step up to Kryonaut only if your cooler and case already have headroom problems that a few degrees would solve, and treat the unbranded kit as a stopgap rather than a long-term choice.
All 6 Picks in Detail
1. ARCTIC MX-4 (4 g) – Best for First Builds
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The 4 g MX-4 tube is the sensible default for anyone assembling a desktop. It is a carbon micro-particle compound that ARCTIC describes as non-conductive and non-capacitive, which means a small spill onto motherboard pins or capacitors will not short anything. The paste spreads easily under cooler pressure, so a pea-sized dot in the center of the heat spreader is enough for most mainstream sockets.
- Size: 4 g tube, enough for many applications on a desktop CPU
- Type: carbon micro-particle, non-metallic compound
- Electrical behavior: non-conductive and non-capacitive per ARCTIC
- Intended use: processors, coolers and general heat spreaders
- Application: pea, line or X pattern all work on typical heat spreaders
Pros
- Safe around exposed contacts if you slip
- Large enough tube to cover future upgrades and re-pastes
Cons
- Not the coolest-running paste on the list
- No cleaning supplies in the package
The MX-4 is also the compound most builders reach for when they are not sure what to buy, which means advice and troubleshooting threads on forums almost always assume it. Because the tube is large, you can paste the CPU, practice on a spare chip, and still have enough left to re-paste a graphics card later. Keep the cap on tight between uses so the compound does not dry at the tip.
Compared with the Kryonaut kits, the MX-4 gives up a little peak cooling in exchange for easier handling and a much larger supply.
2. Thermal Paste CPU 1.8g with Toolkit – Best for Occasional Repairs
This listing is a generic 1.8 g thermal paste sold with a small toolkit and marketed for CPUs, GPUs, ICs and heatsinks. The listing name does not state a brand, a thermal conductivity figure or an operating range, so treat the specifics as unconfirmed and check the product page before buying. It makes the most sense when you want something to hand for a laptop repair, an old console, or a spare office PC where a premium compound would be wasted.
- Size: 1.8 g, a small syringe-style quantity
- Includes a toolkit; exact contents – confirm on listing
- Stated compatibility: CPU, GPU, IC and heatsink use
- Conductivity and viscosity: not stated in the listing name
- Electrical behavior: confirm on listing before using on bare dies
Pros
- Bundled tools help with small repair jobs
- Small quantity suits one-off use
Cons
- Manufacturer details are thin, so performance is unverified here
- Only 1.8 g, so there is little left after a couple of applications
Because the maker is not named in the listing, there is no manufacturer page to cross-check, which is the main reason it sits lower in the ranking. A sensible use case is a spare-parts drawer: if you occasionally open older hardware and just need fresh paste with a few small tools, the kit saves a separate purchase. For your main gaming build, spend a little more on a named compound.
It is the runner-up of the set: if you want a known quantity, either ARCTIC MX-4 listing is the safer buy.
3. Thermal Grizzly Kryonaut with 12 Cleaning Wipes – Best for a Complete Re-Paste
Kryonaut is Thermal Grizzly’s well-known high-performance compound, and this version adds twelve cleaning wipes, six wet and six dry. That pairing matters because old paste must come off completely before new paste goes on. Retailer and manufacturer-linked pages list Kryonaut at 12.5 W/mK and describe it as non-conductive, which is why it is a favorite among overclockers and builders running powerful processors under compact coolers.
- Size: 1 g of paste plus 12 wipes (6 wet, 6 dry)
- Published conductivity: 12.5 W/mK (manufacturer-style spec; real-world gain is smaller)
- Electrical behavior: listed as non-conductive
- Consistency: soft and light grey, spreads easily
- Intended use: demanding applications and overclocking per the listing
Pros
- Wipes make surface prep faster and cleaner
- Strong reputation among enthusiasts for low temperatures
Cons
- Only 1 g of paste, so it is not a stockpile
- Softer paste can pump out sooner than thick, long-life compounds on some setups
The cleaning step is where many first re-pastes go wrong, because dried compound left in the corners of the heat spreader can hold the cooler off the surface. Having wet wipes to dissolve the old layer and dry wipes to finish the job removes that guesswork, and it keeps fibers out of the socket area compared with paper towels.
Choose this over the plain 1 g Kryonaut when you are removing an old compound, since the wipes are the only difference.
4. Thermal Grizzly Kryonaut (1 g) – Best for a Single High-Performance Application
This is the same Kryonaut paste in a bare 1 g syringe, aimed at overclocking and demanding builds. A gram is enough for a few applications on a standard desktop processor if you keep to a pea-sized dot, though larger heat spreaders from workstation sockets will use it faster. If you already own isopropyl alcohol and lint-free cloths, you do not need the wipes and can save money for other parts.
- Size: 1 g syringe
- Published conductivity: 12.5 W/mK per retailer and manufacturer-style specs
- Electrical behavior: described as non-conductive
- Operating range: listings quote an extremely wide span; confirm on listing
- Fit: desktop CPUs, GPUs and heatsinks
Pros
- High-performance formulation in a minimal package
- Easy to apply with a dot or line method
Cons
- Small syringe runs out if you re-paste often
- No cleaning supplies included
Between the two Kryonaut options, this one suits experienced builders who already have cleaning supplies at hand.
5. ARCTIC MX-7 (8 g) – Best for Long-Term Supply
MX-7 is ARCTIC’s newest MX-line formulation, and the 8 g tube is double the MX-4 size. ARCTIC’s own comparison, reported by Tom’s Hardware, found it about 3 percent cooler than MX-6 and up to 6 percent cooler than MX-4 on a Core Ultra 9 285K at roughly 284 W. That is a manufacturer test, so read it as a direction, not a guarantee. Independent measurements by Igor’s Lab put thermal conductivity near 6.2 W/mK, and the paste is non-conductive and non-capacitive.
- Size: 8 g tube
- Electrical behavior: non-conductive and non-capacitive
- Viscosity: higher than older MX pastes; ARCTIC leans toward a dot-style application
- Marketing focus: long durability and consistent contact
- Fit: CPUs, GPUs, consoles and laptops
Pros
- Newest formulation, with a generous supply
- Designed for stable contact over long use
Cons
- Thicker paste is harder to spread by hand
- Overkill if you only paste one machine every few years
An 8 g tube also suits anyone who builds for family and friends, since one purchase covers dozens of applications and the shelf life stated by the maker is measured in years. Remember that higher viscosity means you should not expect it to flatten under a cooler as readily as thinner pastes, so tighten the cooler evenly and fully.
Pick it over the MX-4 if you value durability and plan to paste several systems from the same tube.
6. ARCTIC MX-4 with Spatula (4 g) – Best for Beginners Who Want Tools
This is the same 4 g MX-4 compound as the first pick, bundled with a small spreader. It is a convenient choice if you prefer to spread paste into a thin even layer rather than rely on cooler pressure. Many experienced builders skip spreading because the dot method works and avoids air bubbles, but for a first build a spatula can feel reassuring. The paste itself remains non-conductive and non-capacitive per ARCTIC.
- Size: 4 g tube with spatula
- Type: carbon micro-particle compound
- Electrical behavior: non-conductive and non-capacitive
- Included tool: spreader (exact material – confirm on listing)
- Fit: processors and coolers
Pros
- Same proven paste as the plain tube
- Spreader helps beginners control coverage
Cons
- Hand-spreading can trap air if rushed
- Offers no advantage once you are comfortable with a dot
If you do use the spreader, keep the layer thin and even, avoid pressing hard enough to scratch the metal lid, and wipe the tool clean afterward so it stays usable for the next job. Many builders end up leaving it in the drawer once they trust the dot method, which is a sign the paste matters more than the accessory.
It is functionally the first pick with a tool added, so choose between them on whether you want that spreader.
Specs Compared
| Product | Paste size | Brand or line | Published conductivity | Electrical behavior | Extras |
|---|---|---|---|---|---|
| ARCTIC MX-4 (4 g) | 4 g | ARCTIC MX-4 | Confirm on listing | Non-conductive, non-capacitive | None listed |
| Thermal Paste CPU 1.8g with Toolkit | 1.8 g | Not stated | Confirm on listing | Confirm on listing | Toolkit |
| Thermal Grizzly Kryonaut with wipes | 1 g | Thermal Grizzly Kryonaut | 12.5 W/mK (published) | Non-conductive | 12 cleaning wipes (6 wet, 6 dry) |
| Thermal Grizzly Kryonaut (1 g) | 1 g | Thermal Grizzly Kryonaut | 12.5 W/mK (published) | Non-conductive | None listed |
| ARCTIC MX-7 (8 g) | 8 g | ARCTIC MX-7 | Not published by ARCTIC; independent measurement near 6.2 W/mK | Non-conductive, non-capacitive | None listed |
| ARCTIC MX-4 with spatula (4 g) | 4 g | ARCTIC MX-4 | Confirm on listing | Non-conductive, non-capacitive | Spatula |
How We Chose These
These six come from the current catalog listings for CPU thermal paste, so the set reflects what is actually available rather than a hand-picked wish list. We compared each listing name against manufacturer product pages, retailer specification fields and published coverage, then weighed four things: electrical safety for bare PCB work, published or independently measured thermal behavior, how much paste the package provides, and whether the bundle includes the tools a builder needs. We did not run our own temperature runs, so performance comments rely on published sources and are labeled as such. Where a listing omits a specification, the article says so instead of guessing.
What to Look For
Conductivity numbers are a poor shopping signal
Thermal conductivity, measured in watts per meter-kelvin, tells you how well a material carries heat through bulk. Paste sits in a layer only a few thousandths of a millimeter thick, so interface resistance and how well the paste wets both surfaces matter as much as the headline figure. That is why a 12.5 W/mK label does not translate into a 12.5 W/mK improvement, and why ARCTIC deliberately avoids quoting a conductivity for MX-7. Compare pastes within the same brand family and use published testing, not the highest number on the box.
In practice, the gap between a good mainstream paste and an enthusiast paste is usually a handful of degrees Celsius on a hot CPU, and often less than that on a cool-running chip. The difference between a decent paste applied well and an excellent paste applied badly is larger than the difference between the two pastes themselves.
Non-conductive versus liquid metal
Every paste in this guide is a non-metallic, non-conductive compound, which is the right choice for nearly all home builds. Liquid metal is a different class that conducts electricity, can short nearby components if it escapes, and can damage aluminum surfaces. It is aimed at advanced users delidding processors. If you are not sure you need it, you do not.
How much paste, and where
For a standard desktop heat spreader, a dot about the size of a grain of rice to a small pea in the center works well. Cooler mounting pressure pushes the paste out into a thin layer. Very wide processors, such as workstation sockets with large lids, call for a line or an X pattern so the edges are covered. Too much paste simply squeezes out the sides, while too little leaves dry corners and creates hot spots.
A useful rule of thumb: if a typical application uses about 0.15 to 0.25 g, a 4 g tube covers roughly 16 to 26 applications, while a 1 g syringe covers about four to six. Those figures are an estimate based on dot size, not a manufacturer claim, but they show why small syringes disappear quickly if you rebuild often.
Prep, cure time and replacement
Remove old paste with a lint-free wipe and high-concentration isopropyl alcohol (90 percent or higher), let the surface dry, then apply new paste. Some compounds improve slightly over the first days of use as the layer settles. Replace paste when you swap a cooler, when temperatures climb without a clear cause, or roughly every three to five years on a system that runs hot. Do not re-use paste that has been squeezed between two surfaces once the cooler comes off.
A worked example: matching paste to the build
Picture two builds. The first is a mid-range desktop with a tower air cooler, a processor that stays well under its thermal limit, and a case with good airflow. Any of the MX-4 options will keep that machine comfortably cool, and the money saved is better spent on a second case fan. The second is a compact build with a high-wattage processor, a small cooler and an owner who runs sustained all-core workloads. There the few degrees offered by Kryonaut or MX-7 can delay fan ramp-up and reduce thermal throttling, so the premium compound is justified. The rule of thumb is simple: fix airflow and cooler fit first, then upgrade the paste when you have run out of other levers.
Also check the order of operations when you re-paste. Shut down and unplug, remove the cooler with a gentle twist to break the seal, clean both surfaces, apply paste, mount with even diagonal tightening, and only then reconnect the fan header. Skipping the diagonal tightening is the most common cause of uneven contact.
Bare dies and laptops
Laptop processors and graphics chips often sit directly under the cooler with no metal lid, so a conductive paste could be dangerous near surface-mount parts. Stick to non-conductive formulas, apply a thinner amount, and read your laptop maker’s guidance before opening the case, since warranty terms vary.
Questions
Is expensive thermal paste worth it?
Only to a point. Premium pastes such as Kryonaut or MX-7 can shave a few degrees on a high-wattage CPU, but a well-applied mainstream paste is within a small margin for most builds. If your cooler is already adequate, the extra spend rarely changes noise or performance.
How long does thermal paste last?
Most pastes are designed to last several years inside a PC, and many builders replace them every three to five years or whenever the cooler comes off. Hot, heavily loaded systems may need attention sooner, especially if temperatures drift upward without a dust or fan explanation.
Can I mix different thermal pastes?
Do not layer one paste over another. Clean the old compound off fully with isopropyl alcohol first, then apply a fresh dot of a single paste. Mixed layers can trap air and make contact worse.
Is a spatula necessary?
No. The dot method relies on mounting pressure to spread the paste, and it typically produces fewer air bubbles than hand-spreading. A spatula is optional, and for thick formulas such as MX-7 the manufacturer’s own instructions lean toward the dot method, so check the packaging before spreading.
Do I need new paste if my cooler has pre-applied compound?
Not on a fresh install, because pre-applied paste is made for the first mount. If you remove the cooler later, clean the pad and apply new paste, since the original layer will not reseat properly.
Is non-conductive paste really safe to spill?
It is much safer than conductive options, since a stray smear will not bridge contacts. You should still wipe spills off the socket and motherboard, because paste in a socket can interfere with seating or attract dust.
Update History
- October 20, 2026 – Initial publication; product set drawn from current catalog listings.
- Check the product page for current specifications and availability before buying.
Sources
- Manufacturer product and specification pages for ARCTIC and Thermal Grizzly products
- Retailer listing titles and specification fields for all six products
- Published coverage of the ARCTIC MX-7 launch, including the manufacturer’s own comparison data as reported by Tom’s Hardware
- Independent thermal paste measurements published by Igor’s Lab for the MX-7
