I've got a Dell XPS M1730 running Nvidia 8700M GT 512MB SLI and runs 2 instances of WoW okay. If I minimized everything, I think I could push 3. If you want to 4-box, I'd say you have to get the 8800M GTX 1GB, but that's top-of-the-line that'll cost you an extra grand, just for the card.