It's pointless going past 3gb on a 32-bit version of Windows XP or Vista, 4gb even more so as neither OS can access that much memory. You certainly can't go past 4gb as there's no way to represent addresses beyond that in 32 bits.
4gb, running 64 bit. Will probably go to 8gb in the next few months.
Ah, that's different.
Yes yes, quadcore and 4 gigs. need the 64bit OS, that's why I'm a Vista fan.