The guys at Viper's Lair reviewed a bunch of Thermal Compounds :
The focus will be on some new Nanotherm products, but we rounded up some of the more common thermal compounds and see if the exotic stuff works better, or if it is simply hype.
"In terms of performance, other than the XTC and EXP products, performance between the compounds was relatively equal across the board. Even the absolute worse was only one degree higher than the Nanotherm Ice and Blue. The question now is what to buy and do you need it."