You can use nVidia cards, you just can't SLI them. But yes you can use two ATI cards in CrossFire, if they support it.Yeah sorry I meant provide a link to a motherboard with a X38 chipset. I guess the two PCIe slots on the X38s is for ATI use?
SLI is nVidia's term for connecting two or more video cards together to assist the computer in 3D applications and games.So what would be the point of running dual GPUs without SLIing them?