DX 9 can't support HDR rendering and at the same time antialiasing. So DX10 or 11 is important for a large range of contrast and brightness, colour range. For true lighting it takes a top end i7 and raytracing + global illumination software, which render a frame per minuets. So over a decade off for pure realism. Could of done more with DX9 but you might as well rewrite the rendering engine for DX11 if you're going to do it.
Bare in mind all you need Windows Vista, Win 7 or Win 8 to run DX11 graphics. XP can't even run DX10. I'm sure Farsight will add the option to run in DX9 with no AA or AA with no HDR.
Bare in mind all you need Windows Vista, Win 7 or Win 8 to run DX11 graphics. XP can't even run DX10. I'm sure Farsight will add the option to run in DX9 with no AA or AA with no HDR.
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