Error message adding more than 4 cards on Asus Z390P

Whenever I try to add more than 4 GPUs I get this error message. I’ve swapped out all the risers and psu. I’ve even replaced the motherboard and keep getting the same error. I have above 4g enabled and gen 2 on all the pci settings. Any help would be greatly appreciated.

I am having the same problem with the same motherboard, after looking into it, it seems it is just the motherboard.

Really? Damn. I thought this motherboard was made for mining

Did you manage to solve this problem because I have the same?

Nope. I know people using the same board that have 5+ cards on it too so… idk. I have 2 rigs with 4 cards each now, luckily had an old pc was able to scalp for parts, only had to buy an old motherboard.

Enable uefi mode , cheers

I have same question! but other same motherboard is good. but have diffrent of CPU.
1.CPU :2 × Intel® Celeron® G4930 CPU @ 3.20GHz @ z370-F can not install over 4 card.
2CPU:4 × Intel® Pentium® Gold G5420 CPU @ 3.80GHz @z370-F is good .

now I am waiting the new Pentium® Gold G5420 to test.
maybe tomorrow I can give you the answer!! Just wait.

Any luck?

No… finally ,change to PRIME Z370-P II