Updated NVIDA drivers and now no more intermittent graphic boot issues. I am using 15,1 with the applegraphicscontrol edits. As a side note I updated fakesmc and plugins to 6.18.1394 and now have proper hardware monitoring for the GPU.
I have the GTX 970 and the operating system El Capitan 10.11.2. Installed proprietary drivers from Nvidia driver and CUDA. However, not a single application the ability to use technology called CUDA does not appear. How can I activate them?