Worse performance on crossfire than with single card

I also have this problem and i also found one of the patches has made it worse.

i5 3570k @4.2Ghz and 7850's when playing low settings 1080p 144Hz there are drops to 40 even 30 when crossfire. But when on a single card the fps is much more stable between 70 lowest up to 144(capped). I hope we get a good crossfire driver soon!!