I decided to upgrade my 5,1 with a 780 GTX instead of get a nMP. Part of the reason is that I much prefer Team Green to Team Red.
I'm sure OpenCL vs CUDA is a crucial piece of the puzzle; including an Nvidia GPU in Mac Pros at this stage would only be helpful to CUDA, which Apple clearly does not want to do. Perhaps Apple would warm up to Nvidia after a few AMD-equipped Mac Pro refresh cycles firmly establish OpenCL as the de facto GPGPU platform on OS X?
I'm sure OpenCL vs CUDA is a crucial piece of the puzzle; including an Nvidia GPU in Mac Pros at this stage would only be helpful to CUDA, which Apple clearly does not want to do. Perhaps Apple would warm up to Nvidia after a few AMD-equipped Mac Pro refresh cycles firmly establish OpenCL as the de facto GPGPU platform on OS X?