I'm currently running ATI HD3870s in Crossfire and have had no problems running Steel Beasts Pro with Crossfire on (or off for that matter) Also I ran it in the past with X1900XTs in crossfire and had no troubles there either. I don't know if there was a benefit however as I haven't tried doing any benchmarking or testing of performance. AFAIK the 'Catalyst AI' setting in the ATI Catalyst Control Centre can have a large impact on peformance with Crossfire (and even create/solve crashes) Marco