Tested: Optix for GTX - The Good and the Bad - Technical Support - Blender Artists Community
New Intel Open Image Denoiser in Blender 2.81 - Evermotion
cycles render engine - Denoising not working with GPU - Blender Stack Exchange
Can't find Nvidia D-noise in blender 2.82. And add-on for 2.81 is unavailable to download - Compositing and Post Processing - Blender Artists Community
Blender 2.82 Released with AI Denoiser for Nvidia RTX GPUs, More - 9to5Linux
GitHub - troopy28/OptiX-Denoiser-for-Blender: Use the powerful NVIDIA OptiX AI Denoiser directly from Blender with this addon.
Nvidia Optix Denoiser in Blender - Daz 3D Forums
How to use Intel denoiser in Blender - Artisticrender.com