Ray traced rendering is dead, or rather deprecated. It is no longer being developed and was never very good. I wouldn't waste my time worrying about it or messing with it. You will have much better success using the Cinema 4D light app that is included now.
No, GPU acceleration is only available with a compatible Nvidia GPU.
You are wasting your time even thinking about this stuff. It's dead, dead, dead. And contrary to Rick, I wouldn't out up with the garbage Cineware workflow, either. Simply buy Element 3D.