I have the z77a-gd65 and i cannot get 5 cards to run.  I have tried all different combinations of slots and i always have 1 card which shows up in windows but has a code 43 problem.  Can someone please help i want to get 5 cards running on this board.  Then hopefully 6!  I am runing 7950s with win7 enterprise x64.  Please help!!!!  Thanks so much