In the linked article, benchmarks are shown for CUDA as well. Of course that's also nVidia-only like OptiX. And antecdotally, OptiX is around 1.5-3x faster tha

In the linked article, benchmarks are shown for CUDA as well. Of course that's also nVidia-only like OptiX. And antecdotally, OptiX is around 1.5-3x faster than CUDA with Cycles rendering.