Yeah for a setup like that you would need 2 pc's. Unfortunately WoW isn't smart enough to be rendered properly across 2 video cards in a single machine. I've got a kick ass i7 rig but i'm gonna build a cheaper amd quad core to run slaves on so I'll soon be using a duel pc boxing setup. Not that I really need to, 5 instances on my i7 is cake but i'm the grinch when it comes to resources so i need more!! lol