First off thanks for posting, I really appreciate that you took the time to share your results.

what is your powertune set to? +20?

actually if you could post setting info for cgminer or whatever you're using that would be awesome. Both scrypt and btc if you don't mind. I have a sapphire 7990 malta in the mail right now. hope to have two for xfire by the time Battlefield 4 comes out.