I have 7 cards setup - works ok, but requires a monitor to boot. 5 cards setup on same MB - does not require monitor connected - not sure what this problem connected to (
Micax1, on the ASRock Z87 Killer (Fatal1ty), did you have to short any of the pins in the PCI-e slots to get all 7 GPUs to work/be recognized?
I'm running 2x rigs with 6x GPUs per on this same board. Works fine, but i can't get the 7th working or I get video errors when the Xorg tries to start. Possible driver issue (R9 290s and R9 280Xs)? Other than that the board is a champ, but yet it requires shorting of anything other than a 16x->16x riser, so that means USB risers require shorting in all ports. I'd avoid the first 1x as it seems to be the most problematic.
Good info nvandertill, I've still got a couple questions to make sure I understand what you've done to the board.
I've got 3 cards plugged directly into the 16x slots (without touching the bios). If I want to install cards in the 1x slots using risers do I need to ground each 1x slot? When grounding using 68 Ohm resistors you just need to plug the resistor into B17 only (not A1 or any other ground), right?
I think I know the answers, just want to make sure.
Thanks in advance