My HD 7770 was idling at 0.825 and full load on 1.215.
Since I overclocked my CPU, DIMM and motherboard through BIOS I see that my GPU voltage is stuck at 1.000 V.
It doesn't go to 0.825 V on idle and neither above 1.000 V on full load.
I tried to change the default voltage value that is default 1175 mV but nothing happened. The value is stuck at 1.000 V no mater what.

And please enable GPU Tweak to turn off the Hot Keys I can't use "@" when GPU Tweak is running.