Premiere Pro did it fine, but After Effects CC would not do it, and strangely the 670 isn’t listed in supported GPU’s but I got it to work.
First i booted as root, and was still having the same problem, so I decided to manually hack After Effects CC.
VidMuze has instructions for CS6 which worked for me in CS6, so i did them in CC or at least added the card name from CS6 and put it into the CC file. http://www.vidmuze.com/how-to-enable-gpu-cuda-in-adobe-cs6-for-mac/
Now my video card works in After Effects CC for Ray Trace.
Now it’s time to re-install my plug-ins and hope they all work. Red Giant as already updated their installers to work with CC.