MSI z170a pro - only 2 GPU detected...

[Malbo]

Hi, i try to set up 2 rigs of 6x 1070 but i have only 2 GPU détected at maximum.

I'm on win7 x64 pro, i flash the bios of the motherboard without PCI connected, try all different gen, plug GPU one per one, update Windows, but nothing work...

my other rig (6x1060) didnt have any problem like this with windows 7, but i have another motherboard (h81 pro btc)

please help me!