Blender 3.3 AMD Radeon HIP vs. NVIDIA CUDA/OptiX Performance

Earlier this month Blender 3.3 released and in addition to introducing an Intel oneAPI back-end, it's notable for bringing improvements to the AMD HIP back-end for Radeon GPUs. Significant on the AMD side is extending GPU support back to GFX9/Vega. Thus it's a good time for a fresh round of benchmarking for showing how the AMD Radeon HIP performance against that of NVIDIA's existing CUDA and OptiX back-ends.