From my experience (and from what I've read) the break-even point between 32 and 64 bit is usually 4gB of RAM. If your system will handle more than 4gB of RAM you likely won't see any dramatic performance increases - but you'll be able to leave more applications open at one time without experiencing lag due to the open programs.
I've got 8 gB of RAM on my x64 Vista - and I can play games with no lag while leaving 8 or 9 programs open in my Task Bar, 18 icons in my System Tray, 22 tabs open in Firefox and 8 tabs open in Internet Explorer.
Edited by usasma, 21 December 2008 - 11:10 AM.
added second paragraph
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