Best thermal compound?

[ITeaBagelU]

Looking for the best thermal compound. No liquids.

I did some research and found out thermal grizzly kryonaut performed the best. Is this true?

 

[MeanMachine41]

It may be advertised as the best however it is not the best in terms of thermal conductivity.
The Kryonaut has a specification of 12.5 W/(mK) which is not very good as compared to Arctic MX4 or Arctic Silver 5 which have excellent thermal conductivity.
TIM can range from 1.5 to 9.0 w/mk (watts per meter kelvin) and the higher the better for thermal conductivity.
Arctic MX4 is an excellent TIM at 8.5 W/(mK)
AS5 is almost the same at 8.9 W/(mK) which is what I use in my builds.

Also: Thermal paste or TIM should be applied sparingly to fill just the tiniest of voids.