“Arctic Silver uses micronized silver compounds to increase the thermal conductivity of the compound in order to better transfer heat from the CPU to the heatsink. Using Arctic Silver over the white grease will yield a 3-8C drop in temps over the white compound allowing you to have a cooler CPU and potentially more room to overclock with. You can buy Arctic Silver here
http://www.overclockers.com and find out how to apply it properly here,
http://www.overclockers.com"