Pls change the motherboard. I donīt know whats the others will say on it, but for me itīs a piece of junk if you want to use more than 5x vegas... Asus mining expert is better.
I agree, go with Asus Prime Z270 A of P, i'm using both of them and they work fine with 8x RX 580 (you'll need 1 or 2 M.2 to PCIe cards).
I thought the problem was with 4G decoding but you wrote the cards work on 1 PSU. Maybe you're not connecting the add2PSU card like you should or it's broken? PSU1 PERIF (molex) goes to add2PSU and PUS2 MB (mobo) goes to add2PSU. GPU0....GPU3 8pin+risers to PUS1 GPU4 8pin+riser to PSU2
When you switch ON the power on PSU1 you should hear a "click" sound in your add2PSU (relay).
Hi there, I tried putting pci-e hub in slot 2 (x16) and had no luck booting win10 with 8 GPUs. I also tried disabling "everything" in bios so I can free some extra lanes but had no luck. I guess it's 7GPU limit for this mobo