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
I could do 6/6/1/5 for a few hours, then I kept going lower to have no restarts every 2-3-4hours and in the end everything crashes, even with i 0. I know one of my cards is a bit trashed, can only go at low clock mem but it does go for years like that with an other algo or miner, so it's not like the card shat itself completely, it had a 400hour uptime with 11.1 before I switched.