Can't adjust voltage with HD7970 DCII

[anders190]

Hi!

I got my new card yesterday (ASUS HD7970-DC2-3GD5) and have been trying it out since then.

I have a small problem however. If I go into GPU Tweaks settings and enable "Overclocking range enhancement" the voltage is still stuck on 1178-1188 mV while both GPU clocks and memory clocks get unlocked (can move past 1125MHz on GPU and 6300MHz on memory).

I have been looking around a few times, enabling and disabling and such but I can't get it to unlock.

Using Catalyst 12.4 WHQL and GPU Tweak 2.0.8.3.