I can confirm that here It works!!!!!!!!!!!I'm using ATI CF Xtension application. My setup is core i7-875k, 2x Radeon 5770 Vapor-X 1GB.I see a boost in frame rate, in a particular situation (starting on the runway with my preferred free flight setup), from 45fps (no CF forced) to 70fps (CF Forced).My Options of "ATI CF Xtension" are:- Force CrossFire Method -> Auto, determine best by driver (actually it uses "AFR method") (others methods rather than Auto or AFR give no fps gain, and create artifacts to me).- Direct3D as Rendering- Profile: arma2.exeI forced Video Quality Settings to 4xAsync and 4xAA filters (but it should no difference in using CF).Hope this helps!Bye!