Undervolted my GTX 480 to 1V from 1.05V last night. I have not yet tested to see how this affects power consumption or heat. For my initial stability tests, I've only used OCCT's GPU stress test with error checking. I've found it will pick up errors long before my eyes pick up artifacts. I'll be testing it with Furmark later (more stressful than OCCT if set to push the card as hard as possible) before moving on to games.
It was ALMOST stable at 0.988V, but OCCT detected 2 errors right at 11 minutes. Setting the voltage one step lower than that (I believe MSI Afterburner set it around 0.95 to 0.96V) started throwing a bunch of errors within seconds.
I'm a little disappointed I could not undervolt it further. I've seen a few reports of people easily taking these below 0.988V or even 0.95V. Oh well. Perhaps they were not testing for stability with OCCT and are indeed running into errors they just can't see. Maybe, maybe not. In one situation, I read that someone would get errors in OCCT at 725MHz on their GTX 470 while Furmark would appear to be stable at 785MHz. I think I'd rather be safe than sorry in this situation. An error is an error, even if you can't see it.
In my experience, OCCT doesn't seem to pick up many errors related to GPU memory (overclock or undervolted). Furmark and games do a much better job at this.
Either way, it's a small undervolt, but an undervolt nonetheless. Power consumption wasn't an issue before, so I won't complain!
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