Hi guys! Just some numbers from budget RTX card:
CPU ryzen 3900x stock, GPU 2060 stock Inno3d, BMW 27 test
CPU only - 2:03.62
GPU CUDA - 1:13.42
CPU+GPU - 0:48.91
GPU Optix - 0:39,26
So, nvidia optix kernel renders two times faster than just cuda, and 3 times faster than best ryzen available. And beats GPU+CPU combo as well.