I went to a pc/golf fair today and picked up a Kingwin copper hsf for $10, i found it felt about 4times heavier than my stock cooler, i went ahead and put it on, but i want to make sure its not to heavy. I put it on my xp2100+ and my temps are now 35C idle 38C load, down from 51C. I imagine if i put on some AS3 itll go down another 2-4C. since i put this on it runs at normal speed again w/ no probs. BTW, i got a nice set of golf clubs :)