CrossFire issues on AMD GPU

I recently got a new amd gpu hd 7870 ghz, that currently overpasses the recommanded Cf system requiemnts but i cannot get high fps with all my settings on low , 90-100 fps in ffa. I updated all drivers, also i cannot put CF on stretched not only me but also my friends who has an amd gpu. Is there any fixes. like a recommendet Old driver to fix this? please help