I have a Nvidia GTX 770, with Cuda level 2.0. The option of rendering with CUDA is available in the User Prefs, however, I noticed it is still rendering with my CPU. Whether I have the CUDA option checked or the CPU option, the render time is identical, and only my CPU usage goes up, the GPU stays at zero.
In my system I have 32 gigs of RAM, and my GPU has 2 gigs.
I don’t see that option when I use Blender Render. I do see it when I use Cycles but I don’t know how to use that and produces a grayscale image… Is that my only option for GPU rendering?