Attached Link: http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx

Yep, two gigs it is. In head to head benchmark's I've seen on 64bit CPU's versus 32bit CPU's *in servers*, 64 bit CPU's run slower on most things. The only clear speed increases happen in graphics and database applications; everything else runs slower. It makes sense, since you're pumping twice as much data through a CPU, which in most cases is wasted. I generally tell people to avoid 64bit CPU's for at least a year.