Ok, I was reading in PC gamer magazine's "pc bulding bible" and they say that amd 64 processor are incredibly fast, but there are no windows compatible versions coded to take advantage of amd's 64 bit technology. So everything is running at 32 bits and then I see an advertisement that shows the amd symbols and says "the ONLY windows compatible 64-bit pc processor" its for alienware computers. Is it only alienware computers come with windows coded for 64 bits? Or if you were building your own computer, could you find that windows version anywhere? Also, could someone tell me the Hierarchy of amd processor, I understand the "amd athlon 64 3200+, 3400+, 3600+, 4000+" but where do the amd semprons and FX stack up against those? thanks.