Windows 7 64-Bit i5 2500k 3.3Ghz 8GB DDR3 1333Mhz GTX650Ti 1Gb Nvidia Drivers 327.23 1440x900, 4x AA, 4xAF, ambient rendering Enhanced, interaction shader Enhanced , postprocessing Disabled, LOD High Performance mostly smooth but in some maps I experience some slight microstuttering like near the starting area of Awaiting the Storm.