Hi thecrome, i think i may have the same problem as yourself, i just added a gtx770, and cannot get them to sync, ie in slot 2 gtx770 is X8, and in slot 4 the other GTX770 is X4, but these sync when i boot without my ssd card installed at bios level....

Hi Chaps i have tryed everything, from uninstall, installing and a clean rebuild of which worked for a day and now i have uninstalled all asus software.Has anyone got to root of this problem???