The Unigine Heaven Demo is unique in that it is the only demo which allows for the following components in one package.
The ability to compare DX9, DX10 and DX11 in the same environment allows for the unique ability to see how the different cards perform across these different comparable environments.
The benchmark will not run near 30fps in widescreen at max settings. The tool barely runs in Eyefinity on the 5670.
Even with significantly reduced settings, the benchmark will not reach 30fps. Only the DX9 variation comes close at low single-screen resolutions.