64bit. Everyone keeps saying 64bit has more problems but it doesn't. I think people assume it has the same problems as xp64 did.
Performance between x86 and x64 is pretty much the same in games: http://www.firingsquad.com/hardware/amd_nvidia_windows_vista_driver_performance_update/ Faster in some cases, slower in others.
Plus a few games (and it is only a few) have dedicated 64bit modes which run faster. Crysis for one. Got about 10% more fps in 64bit mode.
Performance between x86 and x64 is pretty much the same in games: http://www.firingsquad.com/hardware/amd_nvidia_windows_vista_driver_performance_update/ Faster in some cases, slower in others.
Plus a few games (and it is only a few) have dedicated 64bit modes which run faster. Crysis for one. Got about 10% more fps in 64bit mode.