Cayman won't gain because it is not shader limited so optimizing shaders won't really do that much performance-wise. E.g. if you are able to improve the parallelism by 35 %, the actual performance gain could be around 5-10 % in most cases, if not even less. And when that number is applied to the whole scene rendered, the actual relative framerate gain would be single digit for sure. Yay for 2 % performance boost.