The ARCTIC MX-4 compound is composed of carbon micro-particles which lead to an extremely high thermal conductivity. It guarantees that heat generated from the CPU or GPU is dissipated quickly and efficiently. Superb in performance, MX-4 is the best companion for overclockers and enthusiasts. ARCTIC MX-4 73.2 ° C Prolimatech PK-1 73.6 ° C Scythe Thermal Elixer 73.9 ° C Coolink Chillaramic 74° C Gelid GC-2 74.2 ° C Notcha NT-H1 74.3 ° C Coolaboratory Liquid Ultra 76.4 ° C EKL Alpenfohn Schneekanone 76.9 ° C Thermal Chill Factor II 77.1 ° C Akaasa AK- 455 78.3 ° C Better Tested on Geforce 8800 Unlike silver and copper compound, it ensures that contact with any electrical pins would not result in damage of any sort.