I currently have a dual monitor setup on my 8800gtx. I wanna get 2 more monitors, so I have to buy a 2nd video card. DO I have to buy another 8800gtx or will any video card will do? I have a 680i SLI mobo. I know I cant SLI 2 different video cards, and I didnt plan to anyway. I play something graphically intensive on the monitors that would be running on the cheaper video card.... I assume it would lag?