Some places that could use improvement here, Michael.
1. Test idle power usage. Honestly it shouldn't change much, if at all, while you are running apps. It's at the desktop that you should really see changes.
2. The line graphs were pretty much unreadable. You had black, blue, and then 4 separate shades of red that all ran together.
It looks to me like the 6870 isn't quite getting into the highest power state under DPM. Not only were the benchmark scores consistently a bit lower, it was by far the biggest recipient of the power efficiency gains (meaning it used far less power).