Mod bios on gpu? Which Mainboard? Which cpu? config files?
DDU in safe mode? we need more infos?
Which claymore version/phönixminer
You try it with 1 gpu and then add the next one and then next and so on.
I think it is a driver issue and not hard to solve.
Check your win 10 version. it is very hard to deactivate windows updates completely. the most descriptions are not sufficient.
@markiz73
sorry stupid idea. there are so many things that he can test before installing a new os XD
sorry for my bad english