I agree with tiny, I owned the 780i and overclocked both a dual core and quad core on it, but I felt hindered by the board not that I didn't get great overclocks, but I know the chips had more and the mobo was the hindering part.
Yeah the EVGA 780i FTW would be better if you could get that one is a great board again 790i FTW if you're going to be overclocking heavily.