Device - Arnold for Katana
The Nvidia GPU-based denoiser is available by simply adding an output channel with the same name as another but with a unique name (e.g. "_denoise" appended to the end) and the denoise checkbox ticked. It renders at the same time as the regular AOV of the same name.
Render Device
Choose between rendering with CPU (default) or GPU.
Note:
Information on getting started with GPU with Arnold can be found here .