some of my rigs reverted back to v8.
v9 has some serious stability issues that needs to be adressed.
Check clocks, volts, and PSUs. I haven't had a single crash on 24 cards (470/480). I have moderate undervolt and have PSUs at ~70% load (EVGA P2 1200w, 6 cards each).
At one point my HD7870 rig was set to as far UNDERCLOCKED as I could get it, the card CAN'T be undervolted, and the PSU on it is a Seasonic X1250 Gold *LOAFING* at ballpark 15% of it's capasity.
No, it's NOT the hardware when the same system runs at a serious OVERCLOCK with good stability on v8 running the same IDENTICAL hardware.