I was talking with one of my friends about upgrading and told'em I was looking at the AMD64 socket 939 for gaming purposes and for the upgrading potential. He insisted that socket 939 AMD64 was a bad route to go firstly because since WinXP is a 32-bit OS, the extra instruction in the 64-bit AMD64 would go to waste, and he also said that he's heard bad things about AMD64. I stand by my informed opinion that AMD64's would still outperform an AMD socket A of same working frequency because of the 64-bit versus 32-bit in an OS 32-bit environment. Is this true? Has anyone else had bad experience with the AMD64 and wish they went AMD socket A (XP+) instead?