I have i5 66o on h55m-d2h motherboard,8Bg ddr3 1333,and gtx 760 256 bit ddr5 2GB,but mu moterboard recognize card 2 of 5 times on power on.I try to clean pci-e slot,clock it on 100,pull and put vga,nothing happens.All this happens in pci-e16x slot,but in 4xpci-e work perfect.I have 3 h55m-d2h moherboards,all with same bug.
Does anyone know the solution?