continuing on with trexiL's advice...

I toggled r_multigpu to 0 and 1 in-game with no effect.  Framerates drop by 100 or more when I enable CrossfireX through the Catalyst Control window.  Are there any other settings?  I didn't think there was anything physical on the motherboard to change.

System is:    Asus p8p67 board
                   i7 2600K @3.4GHz
                   Sapphire HD 6970 (2) Video
                   OCZ 1000W PS

It seems to run really well with just one 6970.  Framerates are a solid 250.  Would be nice to see it at full pull though with both cards 

Keep r_multigpu at 1.


Crossfire has matured since last I used it, and there shouldn't be any BIOS settings to change I guess. That said, it couldn't hurt to look.


Couple really simple things to check (pardon me, I don't know how proficient you are)


Make sure you're installed to the correct PCI-e slots. On your board, these are quite obvious (the only ones with locks)
Are you using a bridge, and have you tried both bridge connectors, and have you checked the bridge itself for damage?