Lol
I tested Z270-A PRO MSI and i had up and running 6 gpus.
Now i can run only 5

I messed with options.
Anybody have this motherboard and can tell what did you changed to work 6 gpus ?

Enable 4G Decoding & set PCIe to x1

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SO what else did you change in motherboard bios exactly? I have one with only 3 gpu showing up and windows works for maximum 15 minutes and freezes. Even with simple miner i have no luck for it to work.