I have a 5970 and 2 x 5870... Try Radeon Pro and apply the settings from here >
http://forum.1cpublishing.eu/showpos...4&postcount=18 its the only way I get crossfire working at its maximum potential. Otherwise if I leave it to driver defaults I get 20-30FPS somtimes and 60FPS when it kind of works, but only ever 30%-50% GPU utilisation compared to 100FPS>250FPS with 90%-100% GPU utilisation with Radeon Pro.