I am building a new computer with an AMD Athalon 64 X2 3800. I was wondering if I needed to apply a thermal compound to the bottom of my heatsink/fan. The heatsink/fan came with the CPU. The heatsink/fan has a small pad on the bottom already that looks like some sort of thermal compound. Also if it turns out that i do need to apply a thermal compound what is the best one? If someone one could answer this for me that would be great. Thanks.