Z270H Motherboats Only detecting 2 GPU out of 4

[Lvvk]

Hello, I’m having major troubles with my rig setup. Whenever I go to my device settings it’s only detecting 2 GPU’s out of my 4. All the fans/Cards work, I made sure the Risers were ok aswell. The only problem is it’s not detecting my cards. Whenever I plug in the 4th Card my rig doesn’t boot up.

Specs:
(4) Dual GEFORCE GTX 1060 6G
(1 ) Strix Z270H Gaming Motherboard
(1 ) HX1200 Power Supply Box
(1) 8G Ram
(1) Windows 10 SSD

[Bimmber]

Have you got 4G enabled in BIOS? PCI changed to Gen 2?