TL;DR: All Blender denoisers are supported on RenderStreet. The Optix one can only be used with GPU rendering, so it works only with the on-demand plan. The other two denoisers work with all our plans (on-demand, monthly and Studio).

Blender has three available denoisers at this time:

1.  The denoising filter for Cycles (now "NLM" in the denoiser list). This is the first denoiser implemented in Blender. It works with both CPU and GPU rendering, and is fully supported on RenderStreet, for all our rendering plans.

2. The Nvidia® OptiX™ AI-Accelerated Denoiser. This denoiser has been added when Optix-enabled rendering was implemented in Blender. As the Optix engine can only run on Nvidia GPUs, using this denoiser requires rendering the project on our GPU machines. In consequence, this denoiser is only available with RenderStreet's on-demand plan.

3. The Intel® Open Image Denoise. This is the last denoiser added to Blender and is was initially available as a compositor node. It runs on CPU, and is supported on RenderStreet with all our plans.