MSI Z170a Gaming M5 will not recognize 5th gpu

[Mercenaryminer]

MSI Z170 7 GPU BIOS Setting step by step

I bought 3x M5 and 3x M7 and have come to the conclusion the MSI Z170A M5 & M7 are inconsistent and poorly manufactured as results vary between the exact same model boards. Out of all these boards, only 1x M5 board will do 7x 1070’s stable. All the other boards will only do 5 cards stable. I can get all 7 cards to show up in both Win7 x64 and Win10 x64, but Win10 is the only one stable enough to mine with more than 4 cards reliably IMO. The M5 board that works with 7 cards is made up of a mi…