docs.arnoldrenderer.com/display/A5ARP/7.0.0.0

Arnold 7.0.0.0 is a major feature release adding Intel®’s Open Image Denoise, better denoising quality overall, important scalability improvements on GPU, and better performance and interactivity. We also introduce important API changes, such as the ability to render several scenes within the same process, and shaders now supporting multiple outputs.