I'm beginning to believe my motherboard is not capable of handling more than 2 cards ugh! Msi z170a gaming pro carbon either on boot (windows 8 or 10) doesn't recognize cards, afterburner doesn't show temps and card crashes or opencl hangs on miner
I heard that chipset Z170 causes problems with more graphics cards for mining (in concretely following motherboard:
https://www.asus.com/Motherboards/Z170-PRO/). However, I can not guarantee that this is true. Maybe someone colleague miner has experience with chipset Z170.