It's a miracle to mine in windows with 4gb 10+ mh/s
MSI Z170 Pro A mobo: • 2 x PCIe 3.0 x16 slots (support x16/ x4 modes)
if you use M.2 ssd that can use some PCIe lanes, use some USB flash or SATA ssd and some linux for better hashrate
Ye man, sadly my windows is on m2ssd. possibly what takes some lanes away, and i use this deskop daily so sad.
I do mine with 1070ti around 29mh and rx480 around 19mh if single x16 is taken