Xubuntu Desktop x64 v12.10
sudo apt-get install fglrx-updates fglrx-amdcccle-updates fglrx-updates-dev - was run when I setup the machine not sure what version of AMD drivers I Have - I will check later
The Graphics card is a Power Color HD7950 - (AX7950-3GBD5-2DHV5E)
According to your software it only has Low and High Profile. I can change the voltage for the low profile and see that it takes effect on the Info Page. However I can set the High Profile voltage but regardless to what I set it to it always runs at the stock voltage of 1.188, setting the core clock for the high profile works.
The windows application PowerUp Tuner from power Color can change the voltage resulting in lower power draw at the power outlet and lower temperatures.
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