Just playing with mine now.

M3a79T deluxe 0803 bios. Single 4850 gpu modded for low idle power. Water cooled.

For a quick start I used the bios settings from my 720 and trimmed back the multipliers. 3.8 looked ok in Prime as did 3.9. I could not get 4.0 to prime for more than 15 minutes so switched back to 3.9 for a while. As the 12v line was showing 11.6v I checked the plug in watt meter. For reference the 720 idles around 150w @ 3.8 1.55v, the 955 @3.9 1.55v is idling at 220w, up to 380w under prime As my Tagan psu is a 450w model and prime @ 3.9 has just failed at around 1 hour it looks like I'll have to break out the 750w Seasonic

Silly power draw for 24/7 operation. If I can't get below the 180w idle mark at 3.8 then this chip will be looking for a new home