Thanks for your help in this thread dph313. I really appreciate it. I will try it.
Artifacts went away at 1.1 volts and lasted a lot longer but in the end my overclock wasn't stable at 900 clocks. My temp hit 71c for only a split second a couple times throughout. Average was 69c at full load. I could use more fan speed if I needed it.
Is there anything I can do to get 900 clocks stable or is my card not good enough?