I have all of my monitors plugged into my RX580 on the PCIEX16_2 slot, but the Bios screen doesnt show when i boot up. If i plug a monitor onto the GTX 970 on the PCIE8_1 Slot, it shows up. I tried to change the boot gpu in BIOS, but it will not display. I'm using a GIGABYTE X79-XP4.