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 4850: Performance again seems slightly down at all resolutions.
HD 4870 X2: Here we see no change.
HD 4890: Here we see a little bit of movement in the negative form at the lowest resolution in the minimum department, for the most part though there's no real changes.