I also didn't manage to get them working, even on D3D 11.1 hardware. However, it was the same for NVIDIA. For using the D3D 11.1 API only features, I had to run Windows 8, on Windows 7, I would get the interface, but everything would be set to unsupported on Windows 7. If you look at the D3D11 Options documentation, it also explains that a few features are only available together, and given that the 5950 only supports D3D11.0, that could be part of the problem as well. Not sure if there is any driver shipping with those extensions. Did you try with WARP or the reference rasterizer and see if that works?
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