0.05% is 0.4% - this is the realm of lab power supplies. I went to Anandtech and looked at their power supply reviews - the best I could find were doing 0.8-0.9% tolerance on the +12V rail, and 1.4-1.5% was much more common. Not only that, EVGA's own 1200W power supply, which is a rebadged Antec, measures in at about 1.4%.
As it turns out, it seems the problem was heat related as blowing out the card heat sink caused card temperatures to drop about 20 degrees C and the glitches to go away, but the fact that they are specifying unattainable tolerances for the power supplies to be used with their cards as a way to get out of their warranty obligations is unacceptable. Before starting the RMA process I ordered a new EVGA GTX 660Ti to replace the 460 in my machine, with the warranty replacement 460 planned to go into my wife's machine replacing her GTX 275. As it is, I will be returning the 660Ti unopened.
I sent them the following as a reply to their tech support:
"I consider your assertion that a 0.19V drop (12.302V to 12.112V) on the +12V rail under load as a sign of a faulty power supply ridiculous. This is the voltage drop when the power supply goes from supplying a low load (Windows 7 idle desktop) to a heavy load (playing a GPU intensive game.) Your stated 0.05V is a 0.4% tolerance. Checking out power supply reviews on sites such as AnandTech I found that even high-end power supplies rarely do better than 1%, and 1.5% such as my power supply displays is much more common. Even the Antec Truepower Quattro 1200W which you rebadge as the EVGA Classified SR-2 1200W Power Supply has a 1.4% change in +12V under load (http://www.anandtech.com/show/3807/antec-truepower-quattro-1200w/4) - by your own definition the power supply your own company sells is faulty.
As it turns out, the problem was apparently heat related, as after cleaning out the card's heat sink the problems seem to have gone away.
However, I feel that you were attempting to get out of your warranty obligations by blaming the problem on a perfectly operating power supply. As such, the EVGA 660Ti Superclocked that I have just ordered will be returned unopened, and I will no longer consider EVGA as a source of video cards in the future."
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