Thermal Grizzly Kryonaut vs Arctic Silver 5 – Comparison

Thermal Grizzly Kryonaut vs Arctic Silver 5 – Comparison

If you are a tech fanatic, you probably have heard of thermal paste, the benefits and the cons.

Thermal paste is used to cool down your CPU by helping to dissipate heat faster. This article will discuss what thermal paste is better, the Thermal Grizzly Kryonaut or the Arctic Silver 5.

We are discussing this because the Grizzly Kryonaut and the Artic Silver 5 are some of the most famous and most used thermal paste products while they are actually very different and consist of very different materials.

First of all, you need to know that applying thermal paste is very hard and minor mistakes could potentially kill your CPU, so always consult a professional.

If you really want to do it yourself (we do not recommend it!), please check out this youtube video, it teaches you to apply thermal paste on your CPU on your own:

Simple Thermal Grizzly Kryonaut vs Arctic Silver 5 comparison table.

Thermal Grizzly KryonautArctic Silver 5
MaterialAluminium99,9% silver
Thermal Resistance12,5 W/mK8,9 W/mK
Electrical Conductivity0 pS/m (virtually zero conductivity) 0 pS/m (also virtually zero conductivity)
Specific Weight3,7g/cm34,05g/cm3
Temperature -250 °C / 350 °C–50°C to 130°C (but with peak performance >180 °C
Capacity1,5ml / 5,55g3,5ml / 12g

Differences between the Grizzly Kryonaut and Arctic Silver 5.

Despite having the same use case, the Arctic Silver 5 and the Grizzly Kryonaut have numerous differences.

Different material.

The Thermal Grizzly Kryonaut consist of a couple of substances but is mainly made of aluminium, the Arctic Silver 5 is (as its name says) made of 99,9% pure silver.

I dislike this on the Arctic Silver 5 because silver is naturally very conductive so it would be extremely bad as a thermal paste if it wouldn’t be for the 0,01% of the other ingredient. The entire ‘silver’ thing just sounds like marketing material to me because it would not even be the best material for thermal paste, it just sounds cool to have ‘silver’ on your CPU.

Silver is the material with the highest conductivity (stated by

Conductivity readings
Silver is one of the best conductors.

But as numerous buyers’ reviews stated, the Arctic Silver 5 is in comparison with the Grizzly Kryonaut very hard to smear on the CPU because of the stiff silver.

The Thermal Grizzly Kryonaut and Arctic Silver 5 have different Thermal Resistance.

Thermal resistance is a unit of heat transfer between two elements and is used to see if a material resists heat or inhibits heat.

A higher thermal resistance for thermal paste would be considered better by computer-enthusiasts because your CPU will be colder, the Arctic Silver 5 has a thermal resistance of 8,9 W/mK (watts per meter Kelvin) and the Thermal Grizzly Kryonaut has a thermal resistance of 12,5 W/mK, this means that the Thermal Grizzly Kryonaut blocks more heat than the Arctic Silver 5 and is a better heat blocker.

Difference in temperature.

The Thermal Grizzly Kryonaut and Arctic Silver 5 both have different working temperatures.

  • Artic Silver 5 claims to be able to withstand temperatures up to 130 °C what is very good until you hear about the Thermal Grizzly Kryonaut.
  • The Thermal Grizzly Kryonaut claim to withstand temperatures up to 350 °C! This is insanely good if true.

350/130=2.69 this means that the Kryonaut has 2.69x the temperature capacity of the Arctic Silver 5 and is therefore way better.

Kryonaut is more expensive than the Arctic Silver 5.

The Arctic Silver is 1,45€ more expensive per tube than the Kryonaut thermal paste.

But you pay €11,50 for 3.5g thermal paste for the Arctic Silver and you pay €9,95 for 1g of the Kryonaut thermal paste, this means that the Arctic Silver 5 is actually cheaper than the Kryonaut!

But the question is, do you even need 3,5g? – Probably not, let me explain: with 3,5g of the Arctic Silver you will have enough for 20 servings according to several professionals. So if you buy the Arctic Silver you pay a little more for something you won’t need and is less good than the Kryonaut, for pricing, I recommend the Kryonaut again because it is relatively cheaper.

Similarities in specifications of the thermal pastes.

Besides having differences there is (besides having the same use case) another similarity.

Same electral conductivity.

The companies both claim to have virtually zero electcric conductivity, but because the Arctic Silver is made of 99.9% silver, Arctic says that the thermal paste still could possess a little bit of conductivity and that you should be carefull applying the paste.

This is once again another reason why adding silver to a thermal paste is a really bad decision and they probably almost only did it because it sounds interesting and luxurious.

Pros and cons.

Arctic Silver 5.


  • less expensive per mL.
  • universally recognised as a fine thermal paste.
  • has a cool name.


  • Is made of silver (one of the most conductive materials).
  • Is relatively more expensive per bottle.
  • Could have some conductivity left.

Grizzly Kryonaut.


  • Pure (virtually) 0 conductivity.
  • Has better thermal resistance.
  • Is made of aluminium.
  • Better peak temprature.
  • Cheaper per tube.


  • More expensive per mL.
  • Doesn’t sound as cool as the Arctic Silver 5.

Conclusion: which thermal paste is better?

In my opinion the Grizzly Kryonaut is a way better product than the Arctic Silver and the statistics agree with me. But both thermal pastes are fine and are not really expensive. Besides that the Arctic Silver 5 is an interesting product, it is made with 99,9% silver, but I don’t think it is the best choice for a thermal paste; it sounds cool tho.

The Thermal Grizzly Kryonaut is better than the Arctic Silver 5 in my opinion.