To avoid some possible missunderstanding:

OVP = Over voltage protection (typically if you reach this point the system will freeze/reboot even with no load)
OCP = Over current protection (typically if you reach this point the system will freeze/reboot only under load)

On G92 8800GTS, what we see is likely (i havent tested) to be OCP, which kicks in around 1.6V and high clocks under load.
This is not the idle voltage however, due to overvoltage under load, so you actually can only max out your voltage to about 1.5-1.525V idle.