4 GPU works but 5th kills rig

#1

Having troubles getting 5 GPUs to work.

GPU 0 – Asus RX 560 4GB Micron | Bios Max W: 48
GPU 1 – MSI RX 570 4GB Hynix | Bios Max W: 128
GPU 2 – PowerColor RX 560 4GB Hynix | Bios Max W: 48
GPU 3 – GigaByte RX 560 4GB Hynix | Bios Max W: 48
GPU 4 - GigaByte RX 560 4GB Hynix | Bios Max W: 46

Total W: ±320

MotherBoard: ASRock Z270 Pro4
Processor: Celeron G3900
Ram: 4GB
PSU: Rosewill Quark 750w Platinum
SSD running HiveOS updated to the latest

PCI Riser:
Onvian x4
Powered from 6 pin to Molex (2)
Powered from 6 pin to PSU (2)

Snanshi x1
Powered from molex from PSU
*I tested multiple configurations with running 4 cards and all risers worked fine.

x5 120mm fans powered via molex

I am thinking this is a motherboard setting but I do have another PSU I could try, but its only a 530w bronze.

#2

Was indeed my mother board, followed the instructions in the link below and all GPUs are mining!
Mining is new to me and so far it has been frustrating but a lot of fun!

Link: https://forum.getpimp.org/topic/9/setting-up-motherboards-for-mining/2