Id stay away fro x64 at the moment unless you are planning on using linux or bsd. Windows x64 isdownright atroshus bodge to satisfy 64 bit ppl like urself and well the reviews iv read are to say the least amusing to read. If this is the true 64 bit one then windows x86 wont work that well either from what iv been hearing and its rather unstable. If its the amd64 series then you may get away with it as they are not true x64 but just 2 x86 on the same chip. Untill longhorn comes out asuming you want to use windoz id stay away from x64 and stick with x86. Go for summin like the amd sempron as they are still good for gaming. I run a super game of doom 3 and F.E.A.R with a sempron 1.8 ghz 1 gig ram and a geforce 6 256mb. Linux works great on x64 as it has been compiled for x64 since the technology was first redily available for the public but isnt the easiet to get games going on as they are very few linux ports of games save id games and the ut series but performance is exelent on these.