There isn't ATI tesselator. It's DX11 tessellation, ATI had tessellation before but had to change it for DX11.
Unless there is going to be some instruction in the TWIMTBP games like "remove tessellation when ATI cards are is detected".There should not be any problem.
Very strange that some people would actually approve of such restriction if it could possibly work even though the AMD is first to supply the developers with DX11 hardware and assistance.
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