Guys please use google or the board search there is a crossfire fix out since the 30th March (including one for Nvidia too)
I bet you don't have a Crossfire/Sli settup do you?
For crossfire users AMD released a crossfire profile only for steam users that fixes the flicker but apparently lowers fps even more.
The fix they have gaiven for now is either using the Bioshock profile or F.E.A.R profile both of which remove flickering but only give a mild performance boost.
These are not propper fixes.
4870x2 average 58FPS no flickering at all
so you are saying 58Fps on a rather old Crossfire Card is not a proper fix ??
edit : typo -> 58