I've had quite a bit of luck with the new Arctic Silver Ceramique and Extention
Tech gives you their thoughts here.
All heat-producing elements in your computer that utilize a heatsink have
some sort of thermal paste or adhesive between the chip and the heatsink. First
it was the CPU, but GPU's and northbridge heatsinks soon followed. The point
of thermal paste (some manufacturers use thermal adhesive instead) is to remove
any air between the heatsink and chip, and filling those microscopic pockets
with thermal paste is the best way to do that. Let's take a look at Arctic Silver's
newest addition to the thermal paste market, Céramique, and see if it
can hold up and even beat its predecessor, Arctic Silver 3.