Hey, sorry for bringing up an old topic.
I can confirm that BFME doesn't support Crossfire, as I have a crossfire configuration.
I did, however, force it through the radeon pro tool, but I'm yet to see a difference in the perfomance
Nevertheless, not to brag, but bfme II is not very graphically intense and so far I've never experienced a drop below 30fps in SP on max settings. I'm sure any decent desktop for 400-500 euro and a dedicated graphics card will breeze through most of edain