It says 3 gigs because Windows XP 32bit is limited to 3 gigs. 32bit systems cant really see much beyond 3 gigs. So you have a gig of memory wasted. Given, the new OS would probably use that, but that leaves 3 gigs for your apps.
Here are my specs: Intel(R) core(TM) 2 QUad CPU Q6600 @2.40GHz 2.40 GHz, 3.00 GB of RAM got a Quadro FX 1700 graphics card. It says 3 gigs but its really 4. I think the Quadro uses up a gig itself. Is that a good system? I could get more and more ram with the new OS right?