Radeon ProRender is a Free, physically based renderer developed by AMD. It's build on the highly efficient Radeon Rays technology and Vega GPU architecture, allowing fast render times without compromising the physical accuracy. ProRender offers some performance optimizing features like ability to GPU at the same time and final and interactive rendering denoising that other softwares don't have.
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Radeon Pro Render is free to use.
Pro Can use CPU and GPU at the same time
Unlike other renderers, Pro Render is capable to using CPU and GPU at the same time, increasing render speed tremendously. Pro Render can also use your system RAM and GPU vRAM at the same time to increasing efficiency in complex scenes.
Pro Hardware Agnostic
Runs on AMD, Intel, and NVIDIA so you don't have to worry about it on some hardware.