Not to derail the thread with tehtekystuff, but any of the newer nvidia 500 series cards use a base vpu voltage of 0.92-0.95v depending on their binning. AMD's newer 7970 uses between 1.19 and 1.21v on the binning. Nvidia cards are by far more picky about voltage jumps than AMD cards.
As far as -that- much sensitivity, probably not. Not on the video-card side anyway, .01v is hardly anything at all (most overclocking software moves the voltage by more than that per step), and most video cards are far below their voltage cap anyway (easily shown by the firmware caps for nVidia cards that are still even far lower than what can be reached with proper cooling systems.)