It only works on cards with Volterra VT11xx digital voltage regs, NV GTX260 65nm GTX280 65nm ATI HD4870 4850? and a few other cards.
It doesn't work on any G92 cards from what I can recall because none of them were built with Volterra regs.
If you aren't even sure what voltage regulator is on your graphics card then you probably shouldn't be playing with I2C bus commands unless you know what you are doing.
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