Hey. I'm sure that you can put two different graphic cards once they can run SLI or crossfire together. Obviously not a sli + crossfire (wouldn't work). But I mean like a geforce 6800 gt and a geforce 7800 gtx. Would that work? I think it would. Another question. Could you use a XFX 7800 GT and eVGA 7800 GT in SLI? Thanks.