WTF, now i can't do also anymore ??? I just tried and put it on manual and can try to use the slider and nothing even happens with mine, can't do sh.... Only thing i can change is the memory voltage.
Got to have something to do with the gigabyte driver ( i think it is just the same as 266 from the nvidea site btw )
When i did the updates i used 285 and am pretty sure i could change the voltage then, but because the card became unstable with 285 went back to 266 from gigabyte site, not sure if i flashed the bios again, i think i remember it said i allready had the latest bios version and now ; no voltage changing.
The voltage of the card is in idle 1.04 and under full load something like 1.15 or higher, but that says nothing about your 6950 offcourse.