DX10.1 is a small revision of shader model and a little Antialiasing optimization, if you have plugged a DX10 card instead a DX10.1 capable card those optimizations will not appears but you should can run the game anyways with DX10 only.
So if you are using a DX10 card instead a DX10.1 capable card the game should switch to shader model 4.0, instead 4.1, automatically.
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