I just picked up two of these cards last night and was having temperature issues. I flashed the bios, but could not get the control unlocked...still stuck at 1.2v. Would you mind sharing your method for unlocking it?
Thank you!
I use VBE7 to change the bios settings and then use ATIwinflash to flash it to the card, though I put by bios 'pin' in position 2 beforehand.
Guide here:
http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/Though I couldn't unlock it to have another program change it, i have to flash it everytime i want to change the voltage.
Hope this helps

))
**PS. Make sure you know what your doing when messing with graphics cards bios', you don't want a $400 paperweight....