i have dual ASUS STRIX GTX 970s running in SLI, i have noticed that one card runs in X8 mode and the other in X1 mode even tho there is no other PCI deviced connected that would take lanes away from the GPUs, is there a way to get both cards to run in X8 mode? CPU is a i5-4690K and the board is a ASUS MAXIMUS HERO VII