Thanks for the info! I'll try to be as conservative with voltages as possible.
I think I've found my sweet spot for this card. At these settings, the card has passed multiple 5-minute Furmark benchmarks (1080p, No AA):
Core Voltage: 1050 mV
Core Clock: 1000 MHz
Shader Clock: 2000 MHz
Memory Clock: 2100 MHz (I won't bother overclocking this)
Max Temp: 84C
Max Fan Speed: 98%
This overclock gives me an extra 170 3DMarks (Extreme) and I think Crysis 2 (DX11) will run maxed at a solid 30FPS.
Furmark failed with the Core Voltage at 1037 mV, so I can't lower the voltage at this clock speed. Is this a safe voltage? Is it too much voltage? Do I have room for more voltage?