I have a Geforce 6800 GS OC ("factory overclocked"). It only has 256 megs of GDDR3 and it runs on AGP 8x instead of PCI-E, but it ran WOW and Darkfall ok.

I saw a year-old post from someone who said they could only get 10 FPS with all settings minimized on a 256 meg card.


Overall specs:

Dell Dimension 8300 from early 2004
Pentium 4 3.0ghz (Northwood, pretty old school)
AGP 8x slot with GeForce 6800 GS [256 MB GDDR3]
2 gigs RAM
2 7200rpm SATA HDD's with a pagefile on each