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Vista 64 DX9 2560x1600 16xAAQ everything on 'Super High'
63.55 48.39 68.49 49.87
Vista 64 DX10 2560x1600 16xAAQ everything on 'Super High'
45.61 32.86 46.93 35.59
I've noticed this time and time again, DX10 provides a minor to impressive boost in fps at medium resolutions but utterly falls on it's posterior at high resolutions. I'm not sure why this is.
To those that say they can't see a difference between DX9 & 10, look again at how the 2D objects are rendered. As CoH and Bioshock have shown, they do not properly intersect the 3d world and hense look flat. In DX10 they look far more impressive and '3d'.