The manufacturer only lists SLI and not crossfire on the specs. Obviously it is to their advantage to list the crossfire as well if it is fully Crossfire capable or even just supports Crossfire. That they choose not to list it is significant. And since they obviously know more about their boards than I - or you - I see no reason to take a risk they choose not to take.
Further, the ATI list of CrossfireX certified motherboards includes NONE with the P55 chipset like OP's. None.
http://game.amd.com/us-en/certified_details.aspx?cat=2&cert=1
And I suppose your psychic abilities told you what games and other applications are important to OP? And what his purchase strategy is?