Got a modern mac with a good nvidia graphics card but premiere and after effects won't use your GPU?
All the details - http://www.vidmuze.com/how-to-enable-gpu-cuda-in-adobe-cs6-for-mac/
Install cuda driver from nvidia - http://www.nvidia.com/object/mac-driver-archive.html
Use GPUSniffer to get the card name (both of the apps have a copy of the GPUSniffer - choose one of the following):
/Applications/Adobe\ Premiere\ Pro\ CS6/Adobe\ Premiere\ Pro\ CS6.app/Contents/GPUSniffer.app/Contents/MacOS/GPUSniffer /Applications/Adobe\ After\ Effects\ CS6/Adobe\ After\ Effects\ CS6.app/Contents/GPUSniffer.app/Contents/MacOS/GPUSniffer
/Applications/Adobe\ Premiere\ Pro\ CS6/Adobe\ Premiere\ Pro\ CS6.app/Contents/cuda_supported_cards.txt /Applications/Adobe\ After\ Effects\ CS6/Adobe\ After\ Effects\ CS6.app/Contents/raytracer_supported_cards.txt