@johnjinn somebody gave me that tip of adding one card at a time and that's worked perfect for me. Start with one card, confirm recognition, power down, add second card - reboot, wait for "flicker", confirm recognition, repeat. Glad it worked out for you.johnjinn said:
Update:
I have removed all cards except for one and kept adding one card at a time. For some reason that fixed the issue. I have no idea why that happened, but for now it seems to be working.
big_MIKE said:Some people plug all cards in and then install Windows, and all cards are seen by computer. Unfortunately that never works for me, bad luck I guess lol. I install one card on main 16x slot and then install Windows 8.1 and then AMD 15.12 drivers. If you look in device manager you will see one r7 300 card under display. I then turn off computer, and install next card in slot closest to cpu. There will only be one slot on that side of 16x slot. Turn on computer, Windows should find card in 1-2 min. Screen will flicker, check device manager and there should now be two r7 300 cards shown. Turn off computer and follow same steps for rest of the cards. Starting with the slot furthest from cpu, and working your way towards cpu one card at a time.
Answers
That was exactly it! Thanks a lot!