One of the most popular open source rendering software's now supports using Nvidia's RTX hardware acceleration. Nvidia has worked closely with Blender to implement Optix to allow ray tracing in Blender.
From their dev page:
Almost all of Cycles GPU-supported features (like hair, volumes, subsurface scattering, motion blur etc.) work with the OptiX backend already, so improving render times is as simple as flipping the switch in the settings. How much faster is Blender Cycles with RTX?
The new OptiX backend is showing some significant speedups compared to the existing options. "
"The OptiX SDK includes an AI denoiser that uses an artificial-intelligence-trained network to remove noise from rendered images resulting in reduced render times. OptiX does this operation at interactive rates by taking advantage of Tensor Cores, specialized hardware designed for performing the tensor / matrix operations which are the core compute function used in Deep Learning. A change is in the works to add this feature to Cycles as another user-configurable option in conjunction with the new OptiX backend.
This can be especially useful when doing viewport rendering, so stay tuned!"
So it would seem that tensor cores are good at removing noise and not just creating them