OK after a few thousand combinations in BIOS, lots of reboots, crashes and Bluescreens due to "Driver stuck in Thread (or so)" I believe I finally have it running stable for more than 30 minutes:

BUT.. I have three cards .. Yet it only displays Fan and temp for card 0 .. Shouldn't it display for all cards ?
PS: And no, Card #4 is still not working, as soon as I plug it in the mobo disables the SATA adapter.. What a PITA .. Never buy a ASRock Gaming Z170 K6 Board for a rig... I'm still trying to get that running
Can't see any advantages to use Win 10 on mining rig. I'm using Win 7. 10 needs too much handy work to make it obedient and not traffic-hungry.