The Best Thermal Pastes in 2021

Ice-cool temperatures. The dream of any PC enthusiast. There’s something about low temps that makes each of us shiver in excitement. That’s why we’re constantly seeking the best thermal paste, air coolers, case fans, and the best components to create a system that shreds through games and applications.

When you’re planning out your build, you can’t leave anything to chance. Choosing the best thermal compound will have a positive impact on the heat transfer between your heatsinks and chips. Now, you must understand that you’ll see very marginal differences between different brands of quality pastes. A few degrees at most.

While a few degrees hardly affect performance in most systems, if you’re planning on hitting high clockspeeds, then it really does matter what brand of thermal paste you’re going to use in your build. With that in mind, let’s take a look at some of the products that we’ve prepared for you.

thermal grizzly kryonaut
  • Made for air and water cooling
  • Compatible with sub-zero overclocking
  • Non-corrosive, can work with aluminum coolers
  • 12.5 W / mk conductivity
  • 1.0-gram syringe

In our experience, the Thermal Grizzly Kryonaut thermal compound was great. It’s meant for overclockers, which is a big plus. The viscosity of the product depends on the temperature it’s been kept in, so for best results, we recommend you put the tube in a ziplock bag and submerge it in warm water for a few minutes before applying it to your desired surface.

Applying it will go smoothly if you follow the aforementioned method. The 1-gram tube is accompanied by a thermal application tool, which is very useful if you’re trying to apply it in an even coating. It’s long-lasting and the perfect paste to replace your gritty, dried-out compound.

While 12.5 W / mk doesn’t seem high, the Thermal Grizzly Kryonaut thermal paste conducts heat well enough to be an enthusiast-grade product. Great if you’re getting into overclocking, great if you’re looking for a replacement thermal compound, great all-around.

  • Good heat conductivity
  • Long-lasting
  • No curing
  • Non-conductive compound
  • A bit expensive
  • Hard to apply if kept in cold temps

Antec Formula X Thermal Paste

High-Performance Thermal Paste At Lower Price

antec formula x thermal paste
  • 11 w/mk thermal conductivity
  • 3.5-Gram Syringe
  • Non-Corrosive
  • Not Electrically Conductive

The Antec Formula X Thermal Paste is an exceptional thermal compound that has excellent cooling performance for the price. It comes in a 3.5-gram syringe, enough for multiple applications to a CPU heat spreader. The paste features a thermal conductivity of 11 w/mk,; not exceptional but enough for most users sans extreme overclockers.

The compound is not electrically conductive and non-corrosive, and it’s made to be long-lasting and to have long-term cooling stability. While the manufacturer advertises the paste as super adhesive, it isn’t so don’t use it as an adhesive.

The package includes the aforementioned syringe with the paste along with the plastic spatula for spreading the paste and a couple of wipes for cleaning the contact surfaces. Overall, this is a great thermal paste for most users but if you want to take your CPU to its OC limits and beyond, you’re probably better off with a liquid metal thermal compound.

  • Easy To Apply
  • Great Heat Conductivity
  • Non-Conductive
  • Not As Adhesive As Advertised

Thermal Grizzly Conductonaut

The Best Thermal Paste for Enthusiasts

thermal grizzly conductonaut
  • 1.0-gram package
  • 73 W / mk conductivity
  • Liquid metal compound

On the same note with the previous product, the Thermal Grizzly Conductonaut is a liquid metal-based compound that has great thermal conductivity properties. This is another product intended for enthusiasts who’re looking to maximize their cooling efficiency. In the top for the best thermal paste for CPU overclocking, this product comes in an efficient container with a spout that allows you to control the spread of the thermal compound.

The product is also accompanied by a cleaning kit, containing alcohol wipes, and two cotton swabs for applying the thermal coating. Use a very small amount and just paint it over the surfaces because, as with our previous product, this also presents a risk of shorting your components if handled carelessly.

The Thermal Grizzly Conductonaut has a thermal conductivity of 73 W / mk, making it an entry for our best CPU thermal paste list. If you’re an experienced overclocker, this is a great choice for getting that bump in efficiency, shooting you to the top of the leaderboards.

  • Very good thermal conductivity
  • Great for enthusiasts looking to overclock
  • Specifically made for nickel-plated copper heatsinks
  • Can’t work with aluminum-based heatsinks

Cooler Master MasterGel Maker

Great In-Between Thermal Compound

cooler master mastergel maker
  • 11 W / mk conductivity
  • 1.5-gram syringe
  • 2.6 specific gravity at 25 degrees Celsius

Cooler Master is an industry titan when it comes to cooling. Coolers, cases with optimal airflow, pumps, they do it all. It makes sense that with all of their cooling expertise, they’d be on our list. Whether you want to overclock your graphics card or you’re looking to replace your old thermal paste with a much better brand, the MasterGel Maker is a great product for everyone.

Coming in a convenient 1.5-gram tube, which is plenty for multiple applications, the Cooler Master MasterGel Maker is a good value pick. The thermal grease is high-quality, the thermal conductivity is great, and applying it is a sinch.

The 11 W / mk conductivity is a great value for a non-conductive thermal compound. It’s really a step up from the competition and delivers beautiful results in both casual and overclocked systems. The 2.6 specific gravity (at 25 C) ensures easy application if kept at room temperature.

  • Good thermal conductivity for non-metal based product
  • Great for any sort of application (CPU, GPU, Delidding chips)
  • Flat-nozzle design, great for spreading
  • Expensive for the specifications

Coollaboratory Liquid Ultra

Another Contender to the Best Thermal Paste Title

coollaboratory liquid ultra
  • 38 W / mk thermal conductivity
  • 100% metal liquid
  • Not compatible with aluminum

Another metal-based liquid compound from Coollaboratory, the Liquid Ultra has been featured by high-profile industry influencers as being a great thermal conductor. It’s pretty affordable compared to the competition, and it comes with all of the specifications that a high-end enthusiast would like to have in a quality thermal compound.

The fact that it’s 100% liquid metal does limit its application if you’re inexperienced. Whenever you’re replacing a GPU’s cooling system to add a liquid block or an aftermarket cooler, or when you’re trying to delid a CPU to further increase its performance, you’ll find that it’s important to use a non-corrosive, non-conductive compound to ensure that you won’t damage and short your expensive components.

The Liquid Ultra is great for all sorts of applications. If you’re an enthusiast and have experience with taking components apart, then you can isolate the sensitive areas with liquid tape and proceed to carefully apply the compound. It comes with a cleaning kit, so you’re covered.

  • Good thermal conductivity
  • Good value
  • Only targeted towards enthusiasts for certain applications
  • Not compatible with aluminum heatsinks

Noctua NT-H1

The Best Thermal Paste for Newbies

noctua nt-h1
  • 3.5-gram syringe
  • Not electrically conductive
  • Lasts up to 5 years after applying
  • 8.5 W / mk conductivity

If you haven’t heard about Noctua, then you haven’t been a PC enthusiast for a long time. Noctua is THE cooling fan manufacturer. Case fans, CPU fans, they’re renowned for making the best air cooling solutions for any sort of system. The NT-H1 is their flagship thermal compound, and it comes in a “hefty” 3.5-gram package, which is a lot of applications depending on the type of CPU you use.

It doesn’t have to go through thermal cycles to work properly (we’ll talk about that in the buying guide), so you can just put a dollop on the surface, spread it, and you’re going to see improved temps right off the bat. Application is straightforward, this product having a good density which facilitates the entire process.

As a bonus, it comes with a lot of instructions on how to apply on different chips, so the newbies will have a great time using this premium-grade product by Noctua.

  • Long-lasting
  • Easy to use, comes with tutorials
  • Not the best conductivity when compared to the competition

Arctic MX-5

The Old Reliable

arctic mx-5
  • Density of 3.2 g/cm³
  • Continuous use temperature – 40~180 ℃
  • Breakdown Voltage 250 V/mil

When it comes to thermal paste there is one product that has been used since the olden days and has consistently been praised as good – the Arctic MX series. The MX-5 is another refresh of this legendary thermal paste and as expected it delivers its promise to be good at allowing heat to be transferred to your CPU cooler easier.

The MX-5 has high thermal conductivity, is easy to apply, and is overall safe to use since it is not electrically conductive or capacitive. The MX-5 competes with even heavy lifters like the Kryonaut thermal paste which is a good thing to see.

Overall a good safe option for when you do not know what thermal paste to buy and do not want to waste time doing a lot of research on the topic.

  • Reliable thermal paste
  • Good price for the product
  • Offers good performance in terms of thermal conductivity
  • There is a spatula and no spatula option when it should just have been included anyways

Arctic Silver 5

Flagship Thermal Compound

arctic silver 5
  • 3.5-gram syringe
  • Increasing conductivity based on multiple tempering cycles
  • Not electrically-conductive

The Arctic Silver 5 is a favorite in high-end PC enthusiast circles. Arctic itself is a big name in the thermal compound industry, and the Silver 5 seems to be the go-to choice for a lot of PC builders out there. But why is that?

The Arctic Silver 5 contains a mixture of oils and metallic particles (99.9% silver), which gives it amazing conductivity for enthusiasts. While it does contain metallic elements, the paste itself is not electrically conductive, so you won’t risk any shorts if you are careless with it.

The viscosity is also engineered for easy application, making it a very user-friendly product. The only issue with it is that it takes around 200 hours and multiple tempering cycles (turning heat off and on) to reach maximum conductivity, because of the nature of the mix.

  • Good thermal conductivity
  • Easy application
  • Good price
  • Takes a while to reach full potential based on how much you use your PC


Best Thermal Compound for Beginner Modders

corsair xtm50
  • 5.0 W / mk
  • Low-viscosity makes it easier to apply
  • Comes with stencils and spatula – beginner-friendly

It’s hard to imagine a segment of the PC community where Corsair doesn’t have any presence. On that note, the XTM50 is a low-viscosity liquid thermal compound that promises to bring longevity. Each time you take your computer apart, you risk it being damaged, so having a long-lasting paste is a great way to minimize this type of interaction.

The low-viscosity makes it one of the best pastes in terms of application. That being said, the liquid state also makes it less conductive, so you’ll be seeing modest results when compared to something from Cooler Master, Arctic, or Thermal Grizzly.

Overall, it’s great if you haven’t applied thermal paste before and it still delivers reliable results. It just isn’t meant for high-end overclocking.

  • Ideal for beginners
  • Provides good results
  • Long-lasting
  • Lower thermal conductivity than the competition
  • Not great for overclockers

How to Choose a Thermal Paste


Basically, this will affect your purchase in one of two ways. If the compound is metallic-based, as mentioned above, it must be handled with the utmost care so that you don’t get it on the circuits. In addition to being electrically conductive, it can also corrode your circuit boards and you can effectively brick your expensive gaming motherboard.

If you have an aluminum CPU cooler heatsink, note that most liquid metal thermal pastes will corrode the aluminum and will cause a very bad reaction. Opt for something non-corrosive or use a nickel-plated copper heatsink.

If the compound is not electrically conductive, you can use it for any sort of application without risking shorting your components. Liquid metal compounds are better at transferring heat, so both products have their strengths and weaknesses.

Thermal Cycles

Some products require to go through some thermal cycles to become fully-functional. This means that they have to be exposed to big temperature differences to settle in all the nooks and crannies. The higher the viscosity, the more thermal cycles it will take for the compound to fully activate.


When you’re shopping for thermal paste, there are a few things to keep in mind. The higher the thermal transfer values, the more conductive the paste will be. So 12.5 W / mk (watts per meter Kelvin) will be less conductive than 38 W / mk pastes. That being said, your results will vary, based on your cooling, components, so really any thermal paste from a reputable brand will do the job just fine. In reality, you’ll only see a few degrees -/+ from your previous thermal paste.

You’ll also see the term specific gravity. This measured the viscosity of the paste. Lower values mean that it will be more fluid, making it easier for users to apply it.


A 1.5-gram syringe has around 3-4 uses if you’re using them on standard LGA 1151 or AM4 chips. For LGA 2066 or Threadripper CPUs, you’re going to need to buy 3.5-gram or larger syringes to cover the entire chip.

About The Author

Catalin Tabacu

Catalin is a long-time PC enthusiast and an avid gamer. His love for overclocking is second only to his love for a well-written RPG. Having taken a swing at competitive DOTA2, he has the know-how to give you the best recommendations that will elevate your in-game performance to the next level.

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1 year ago

I’m very disappointed with your review of Arctic Silver 5. Simply stating that its conductivity increases after 200 hours and “multiple tempering cycles” is practically useless. We need to know what its conductivity is once it has cured. Especially as you state it has “amazing conductivity for enthusiasts.” Would you quantify “amazing” please? Without this information you might as well have said “Blah, blah, blah, Arctic Silver 5, blah, blah, blah.” I’m not simply trolling you. I’m building a new system, and am looking for quantifiable data to help me decide what compound to use (Staying far, far away from… Read more »

Last edited 1 year ago by Pheckphul
XbitLabs Team
XbitLabs Team(@xbitlabs)
1 year ago
Reply to  Pheckphul


Innovation Cooling aggregated a number of temp charts and the majority of them also include Arctic Silver 5. Maybe this will help.