Problem with AsRock H110 Pro BTC+ (13slot)

[f00ch0w]

So couple of them arrived today, planning to mount 13x P106s with dual PSU on it...

Now, here's the issue. I can't get more than 4 GPUs working on ethOS. Tried replacing the riser 4 times (4 different raisers), tried replacing the GPU with another one, tried with another PCI-E slot, still nothing, sees 4 GPUs.

Anyone has a solution for this issue? It's quite urgent.

Thanks a lot!