Originally Posted by Tr1cK
I don't have crossfire but it looks like you simply enable it and either let Catalyst AI handle the mode it uses or you can manually set it to one if AI is disabled.
An ATI CrossFireX system has four possible display modes:
Alternate Frame Rendering
this part bothers me, since 4870x2 will also need CF.
Scissors mode i believe is related to SFR
Alternate Frame Rendering is AFR (same as nvidia) and there are two major AFR modes, AFR (older) and AFR2 (newer). AFR2 mostly has higher performance and compability.
Most important part is that each AFR mode has maybe 100 other modes that are set with "multichip_rendering_mode" Value="0x0240440D""
changing one value can fix performance, fix graphical glitches etc..
I still didn't see any proof that you can adjust CF profiles on this high level.