http://www.nvidia.com/object/mental-ray-3ds-max.html
https://blogs.nvidia.com/blog/2017/05/10/mental-ray-for-3ds-max/
NVIDIA® Mental Ray® for 3ds Max is a plug-in renderer for entertainment and visualization professionals who need complete flexibility in their creations. Time tested with over 20 years as the industry standard in 3D rendering; Mental Ray is now available directly from NVIDIA. Mental Ray uses both CPUs and GPUs for global illumination and can exchange materials with NVIDIA® Iray® and Chaos Group V-Ray through the use of the NVIDIA Material Definition Language (MDL).
MENTAL RAY FOR 3ds Max FEATURES
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Full backward compatibility for earlier 3ds Max scenes employing Mental Ray or the Mental Ray Iray mode.
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Latest Mental Ray 3.14 version with continuing updates and fixes
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Interactive progressive rendering so you quickly see final results as you edit
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GI Next makes high-quality global illumination easy - and 2-4X faster than earlier methods, with GPU acceleration making it far faster yet
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MDL support with vMaterials browsing
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Mental Ray Standalone mode is now included for production pipeline efficiency and flexibility.
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When licensed, enables Mental Ray Standalone, Mental Ray Satellite, and the NVIDIA Iray for 3ds Max plug-in.
Mental Ray for 3ds Max is FREE to use within an interactive 3ds Max session. A Mental Ray license is only required when you render outside of a 3ds Max session. Your license then enables rendering with headless 3ds Max, Mental Ray Satellite or Standalone mode, as well as the separately available NVIDIA Iray for 3ds Max plug-in.
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