I am using the same version, but I am at work right now.. Stupid duty stations half a world away... When did that version come out? If it is newer than sometime in June, then you need to back date it one version if at all possible. Ohh forgot that you also have to click on GPU voltage... opps.. try that and see. You can also get guidance here, and proof: http://forums.overclockers.co.uk/showthread.php?t=18389760
It starts at post 11.
I am NOT advocating or advertising the referenced site in any way mods. This is posted as it is helpful for everyone who is looking to unlock their 7850 to the performance of a 7950 or better.
Good luck DaveLT and By-Tor, and anyone else wanting the most performance for dollar.
BTW, if you want truely incredible performance, by the artic accelero twin turbo II and a bios flash to ASUS DCII TOP v1.3. (I have not tried it myself, but it has been reported to work well with other manufacturers, people have gotten up to 1376 on the GPU core benched and stable.. I am just too cheap to mess with it myself...)