i am so confused about this...should we have CUDA installed with the new mac pro D700 or not? i remember doing running some tests and getting slightly better results with CUDA....but that makes no sense? or does it? what is the official work from black magic and or apple?
To put it in simple terms: CUDA is a technology made by Nvidia for nvidia cards only and requires physical cuda cores on the card. Opencl is a similar concept (by that I mean it utilizes the GPU for compute) to cuda but it is open source it works with any GPU that supports it. No extra hardware cores required. The D700/500/300 are made by AMD so you don't need to install CUDA. Even if you did davinci wouldn't be able to use it.
TL;DR No you don't need to install cuda with the Dxxx cards in the Mac pro