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64bit it's faster. but doesn't have 4gb limit.

can go as high as 256gb. but windows 7 it's limited to 8gb.

64bit it's only a bitch if you built your own pc, especially with custom things, making drivers to work are usually a problem but if u buy a sony, dell pc they ship you everything, drivers and apps.

then again 64bit windows can run 32bit apps with little problems, even games.

they run quite well if u have x86-64 cpu like intel core 2 duo, my p8600 2.4ghz 3mb of my notebook it's quite fast.