Hi guys first time tryng to build some rigs with smos its for a client i try with 4 different rigs none could boot with more than 4gpu

All gpu rx 570 580

Mobo Msi z170a Mate

4gb ddr4

intel g3930

--------------------------------------------------------------------------------------------

I update to lastest bios i could managed to get +5 gpu running on windows 10 with 4g and gen 2 But cant get more than 4 on SMOS  it only boots on pci gen > auto ------- when i enable 4g for 5th card it wont load smos it random pixel all screen  same happens if i try any config besides gen>auto or if i try the 5th card without 4 it boots but give me error, i really try many ways but cant get this set up to get more than 4 on smos  if anyone have any idea how can i make it work i will really appreciate it guys,,,,

My best regards