Actually, the total allocation is about 3,336MB - so going to 4 Gigs allows you to max out and take advantage of that extra 264MBs of RAM (4 Gigs = 4,096MB, 3 Gigs = 3,072MB, 3,336 - 3,072 = 264).
A gig cost me only $13 two months ago so that's what I did.
I too have a 9800GT with XP Professional and battles work just fine - I do ge Campaign map lag/sound issues but that is due to the fubar sound DLLs that hopefully will be fixed at some point.
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