I have 3 vista machines.
A laptop with 1GB running 32bit.
A media center with 2Gb running 32bit.
and Gaming PC with 4GB running 64bit.
All of them do the job just fine. The most trouble I've had is with the 64bit one, mainly due to flakey drivers (or no driver atall for odd bits like wireless cards, old webcams etc) I've only ever had a bluescreen on the 64bit version.
Things are snapper with 4GB (but only once everything is cached), but I very much doubt you'd see any increase if fps on any game currently. So it all depends on what sort of performance you are after.
A laptop with 1GB running 32bit.
A media center with 2Gb running 32bit.
and Gaming PC with 4GB running 64bit.
All of them do the job just fine. The most trouble I've had is with the 64bit one, mainly due to flakey drivers (or no driver atall for odd bits like wireless cards, old webcams etc) I've only ever had a bluescreen on the 64bit version.
Things are snapper with 4GB (but only once everything is cached), but I very much doubt you'd see any increase if fps on any game currently. So it all depends on what sort of performance you are after.