Using 8x GPU Nvidia GTX 1070 FE, on windows, Asus Prime z270-a works like a charm 32.100 Mh/s on each card total power 860Watt/h. but i had a big time hassle while i was trying to install the 8th card cos of the cheap m2->PCIe connector , everything  solved when i use a better m2 ->PCIe from amazon --->> Explomos M.2 Key