im trying to run 1 by 1, running smothly except myfirst card r9 390
try the 390 by itself. remove the other two cards.. Make sure its not bad. Then if ok use ddu and remove all drivers in safe mode. try loading the 480 into the first slot hook monitor to that card and load the drivers. then load the other two after you have installed the driver for the rx480
Best Regards
d57heinz
now R9 390 can running smothly with 30mhs (ethash + 600mhs siacoin) at windows 7 , and rx 480 running smpthly at windows 10
i think the main problem i can't use rx 480 and r9 390 at 1 rig