Hello, i have exactly the same issue now.
Did you managed something to get all 6 GPU working? Thank you.
Hello,
Sorry for the late reply. Haven't managed to fix the issue, started using 5 GPU per motherboard and that's it. Somebody who is using the same motherboard has RX570 and he managed to get 6 of them work on single motherboard. Might be issue with nvidia + that motheboard but can't be sure.
Have you managed maybe to get it working?