I've downloaded the trial version of After Effects CS6. I modified the raytracer_supported_cards.txt file to reflect my GPU. Here's the idd thing. When I open AFX preferences and go to preview my GPU is reflected there.
However when I open a comp with a 3D text layer I don't get the option to use the Ray Trace renderer.
I think I know what I'm doing as I installed AFX CS6 on my windows machine and it works great there.