I put a TO-220 heat sink, that I happened to have on hand, on my processor/ram stack. It is not for performance. Heat is what eventually degrades semiconductors and they die. Keeping it cool just extends it's life. Whether or not it will make a "real" difference is unknown. Once past infant mortality a semiconductor lasts about ten years fairly reliably if it isn't running hot. At least that has been my experience. The heat sink is about 3/4" square, black anodized aluminum, with the fins bent up at 90 degrees on both sides, and costs about $.30 purchased new. I also had a bit of thermal paste left over from my last computer build and put a dab of that under. That should be thin as possible, more is not better. I compiled quake3 last night after upgrading the linux load and it finally got up to 51 degrees. Ambient in the room was 21 degrees C. I need to try high quality, but the standard configuration was running at up to 60 frames a sec. It just keeps getting better.