Right now im mining with 3x xfx rx 570 4gb and a powercolor rx 570. But when i tried adding a 580 8gb. System reads all 5 cards but only 2 are working. Tried gen1 lane. Tried rearranging the cards. My mobo is asrock b250 fatality gaming k4. Can any one help me here?
Try reinstall drivers.
is there an big different between the rx570 4gb and the rx570 8gb?
No.
I get 29 MH/s per card but does anyone achieved 30MH/s?
I do. 31MH/s unstable, 30+ stable with RX 470 Strix - Samsung.