With afterburner at 65% power + 780 memory, + 50 core they are running 39.6 MH/s ETH.  System at the wall with 1 card mining was 149W  (28W idle) so roughly ~119W for the card.

I did an awesome miner benchmark at 70%/770mem/50core with the following results.  Wasn't looking at power usage.  I just left it run while doing other things.  It ends up putting the highest hash for all miners after you save so ignore the fact that different miners for the same algo look the same.
https://i.imgur.com/AZU7CEc.png

(sorry, not sure how to get the image to show properly)