Far Cry 2
The Dunia Engine was built specifically for Far Cry 2 by the award-winning Ubisoft Montreal development team. It delivers the most realistic destructible environments, amazing special effects such as dynamic fire propagation and storm effects, real-time night-and-day cycle, dynamic music system, non-scripted enemy A.I. and so much more.
The HD 5770 by itself manages to do a good job of getting over 30 FPS. The CrossFire setup manages to give us a massive amount of breathing room which means we're able to look at increasing the settings even higher.