The AI Upsampler performs a faster render at a lower resolution, then uses AI to upscale to the final resolution.
In Modo, the Upsampler settings are properties of the Camera item, therefore each camera has its own unique Upsampler settings. The Upsampler settings can be accessed from the Render Toolbar > Camera Button > Imager tab.
Upsampler Mode - Selects the upsampler mode for rendering. The image renders at a lower resolution divided by the sampling mode, then it upscales to the final resolution.
Enable AI Upsampling - When an Upsampler Mode is selected and this option is enabled, the render scales using AI upsampling. Otherwise, scaling is done using traditional methods.
Upsample On Completion - Beauty passes upsample once at the end of a render.
Min Upsampler Samples - The minimum number of samples per pixel until the upsampler activates. This parameter doesn't apply if you select No Upsampling in Upsampler Mode.
Max Upsampler Interval - The maximum interval between upsampler runs in seconds. This parameter doesn't apply if you select No Upsampling in Upsampler Mode.