All firmly seated, I have 2 1000W gold rated psus with 3 gpu's each so power is not an issue. I believe the new windows 10 update might have messed everything up. I tried to roll back windows and now I get a kmode exception not handled bsod on boot.
I'm gonna try reinstall windows from scratch at this point.
This might be worth trying.
I had an issue with 2 of my rigs, sudden crashes to a point that I thought the cards might be bricked.
Anyways, turns out that I had CSM turned on in the motherboard's bios,, once disabled, everything worked like a charm