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.
While we've got almost a minimum of 30 FPS for the HD 5770 here, we would say its performance is still too low. On the other hand, the GTX 550 Ti Cyclone II has no issues dealing with Far Cry 2 and we've got averages well above 60 FPS and a nice increase over 30 FPS in the minimum department.