Also try using the CUDA / Nvidia un installer.
I don’t know man everything seems fine. I would uninstall and re install everything.
I had the 980 yosemite resolve light on a 5,1 3.3ghz 12 core and it was playing red 4k full premium real time.
You should get half good no problem.
http://www.filmandtvcolor.com | colorist | Los Angeles, CA
Twitter: @4kfinish