I have a older Dell 400 Xps with a pentium D 3ghz Cpu and i have installed 3 gigs of memory and a nvida xfx 7600gt video card and I replaced the power supply with a 450w. My question is I dont want to buy a hole new computer yet so I was just going to add 1 mor gig of ram and replace my video card. I mostly play wow only and some times other games. How big of a card can i run om my system. I was looking at the Nvida 9800gt or the 220gt. Please help I dont want to buy some thing that my cpu cant use. Thanks Bill