Yea, really noob question, but I can't figure it out!
Spent literally HOURS trying to find how to do this.. Use my GTX 670 to render instad of CPU. Can't figure it out. I finally (I think) figured out where to change the setting to raytraced rendering, but it still REFUSES to use it. I can't work like this! Countless hours to render a 4 min video with an i7? I am checking with a hardware monitor, and my GPU isn't getting used.
I don't have the time (or inclination) to watch hours and hours of tutorial videos. I am the type of person that uses templates and modifies them to my needs/desires, so pointing me to a "generic" after effect tutorial website will do no good.
Now, I only mention this to show that I don't come running for help every time I have a small problem, and refuse to try and find the answer myself. I have myself learned how to edit text, make it appear and disappear. Slow down and speed up an entire composition and much much more all by using google. But I obviously can't get the wording right with google because I can't find a solution.
You cannot enforce GPU raytracing if your card is not supported and that is that. If adding the card to the raytracer_supported_cards.txt file and updating the graphics driver doesn't do it, then nothing will. You are using dead technology, anyway.
Is the composition you're using even utilizing the ray-traced renderer? The only thing that AE accelerates with the GPU is the ray-traced renderer and the ray-traced renderer is an outdated effect.