Originally Posted by atikkur
scroll down to tessmark section, this is pure tesselation benchmark. nvidias tesselation starting to fly off radeons at their extreme setting:
You can't just be doing tesselate alone in game. In a game you have lots of work to do in rendering. Tesselation in a more generic benchmark like unigine heaven stresses all aspects of the card - shader power, tesselation, ROP, bandwidth.
Sapphire HD 7970 (1Ghz ) with the latest drivers is slightly behind at 1080p and slightly ahead at 1600p wrt GTX 680 in Unigine heaven with extreme tesselation, 8xAA, 16xAF. So you are not going to see huge differences in games.
As for compute performance here is Dirt Showdown which uses Direct Compute shaders for advanced lighting and global illumination.
you can read the explanation for advanced lighting and global illumination
the performance at ultra settings is close to 50% faster on HD 7970 wrt GTX 680.
few other sites which have tested Dirt Showdown