I have similar issues.

Tinkering around I can get:

AA to work, but no crossfire.

Crossfire to work, but no AA.

Both break shadows in one way or another, HDR breaks both, but it looks great still minus some odd terrain anomalies, at 15fps or so.

I can get it to "play nice" at 60+ FPS with no eye candy what so ever, but, it looks terrible.

Grrr.

Edit:
Kind of fixed.

Giving up on HDR/Crossfire is the key.

Morphological AA is okay, too.

Last edited by Rupert; 17/03/11 09:56 PM. Reason: I lost my pants.