Although ArmA 2 is set in the fictional ex-soviet state of 'Chernarus' the gameworld is actually a 225 square kilometer chunk of the real world! ArmA 2's highly detailed landscape is a meticulous facsimile of real terrain, modelled using extensive geographical data. This recreated region is brought to life with spectacular environmental effects and populated with dynamic civilian settlements and wildlife. Wild animals roam the atmospheric forests while the people of Chernarus try to live out their lives among the war-torn streets.
ArmA II requires at least a Radeon HD 4850 or GeForce 8800 GT to meet recommended requirements running on high graphics setting, with 1080p resolution. This hardware should achieve 60FPS. You will require a DirectX 9 GPU. In short you need a 13 year old PC for best ArmA II performance.