Does Nvidia’s RTX GPU’s speed up renders in cycles because of it’s optimization for ray-tracing?
I guess, due to using only more cores, it will be better, among other improvements, be it frequency or other (if you compare GTX 1080 TI with RTX 2080TI).
Yes, it will speed up renders, but not because of the optimization for ray tracing. Blender doesn’t use the RT cores at all currently. They may add support for it in the future, but it isn’t clear when.