Ok so I figured out it supports sli, but I guess it will bottleneck the 2nd gpu since the gpu slots are weird. I don't know if this is true or not.This will end up making my decision on sending it back or not, and I would like to keep it when it arrives, but if it creates some bottlenecking on my 2nd GTX 770 in the future then I don't want it. I was specifically buying that motherboard for sli, and it was cheaper, than all the other boards I saw, except for one other one, that I didn't think it would be good by the reviews it got. Im not much of a computer wizard, but if you one of you can tell me if the bottleneck thing is true than let me know! here is the link to the board http://www.asrock.com/mb/amd/970%20extreme4/