4x 280x, 1 of my cards restarts the rig even without asm and with i 0, I can't reduce it any lower, had to revert to 11.1, no OC at all.
The same problem here. One of my 280x hangs causing multiple restarts of the watchdog! Never happened before!
I've been having same problem , at this point a clean reinstall of 15.12 seems to have my 9xR9 280x in 2 rigs at i 5 and i 4,4,6,7 getting avg 300 h/s for 2+ hrs