Radeon Rays is more comparable to OptiX (2009), in that both are GPU accelerated ray tracing libraries. RTX (2018) differs in that it uses special purpose ray t

Radeon Rays is more comparable to OptiX (2009), in that both are GPU accelerated ray tracing libraries. RTX (2018) differs in that it uses special purpose ray tracing units on the GPU, rather than running only on the SMs/CUs.