Which one is the best – Gold Silver Copper Ceramic Silicone ??

This is a table with thermal conductivity of metals used for thermal greases:

Symbol

Metal

Thermal conductivity [W/(m*K)]

Ag

Silver

429

Cu

Copper

401

Au

Gold

317

Al

Aluminium

237

Sn

Tin

66.7

Pb

Lead

34.9

As you can probably know “All that glisters is not gold”, so if you are looking for the best performance for you PC without overheating go for silver thermal paste. Better thermal conductivity will keep your CPU or GPU at lower and safer temperature.