I cant render with my GTX 770! AE CC Version 12.1.
I've tried everything! Other Driver's for the GTX. Try to delete the Card from the List an klick on "Unsupported GPU enabled for CUDA acceleration" .... NOTHING WORK FOR ME! The GPU is everytime at ~0% Load ...
Sorry for Bad English
It seems that you misunderstand what the GPU is used for.
The GPU is used for very little in After Effects. Unless you are using the ray-traced 3D renderer, no rendering will be done on the GPU.