I'm currently running 2x GTS 450 SLI'd cards. Someone told me I have a 2.0 PCI slot for video cards. But someone else said Other cards can be used in it. I'm trying to find out if I can purchase a 750TI card for my alienware and if it will work. But i'm not sure. I think I read somewhere that someone put a 960 in their computer? Any feedback would be amazing. I just have the standard aurora r3.