i tried to mine with thoase cards... - but - from 1 to 5 cards, always getting BSODs one after one, so i tried do slow down speed to 1200MHz core
So default settings not working, and slowed speed not working and so on.
The cards are on powered Risers and on Asrock F2A88X Pro3+ Board
Tried same with 5x XFX RX 480 XXX 8GB - working great.
Any ideas where i can start?