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.
HD 5770 - Here we see no change.
HD 5850 - There's a little bit of movement both ways, but nothing major.
HD 5870 - There seems to be a small drop here. It's not something we would be concerned about, though.