Filmer's built in "Auto Tiles" feature helps prevent Cuda time outs and out of Vram memory errors.
Render Samples control "Auto Tiles" when auto tiles toggle is checked.
Low Render Samples = large tile sizes.
High Render Samples = small tile sizes.
Combined viewport sample + render sample at final render with no fancy node compositing required.
Both noise patterns rendering at the same time retain better detail at lower samples.
Lower values = faster render time. Great with denoising.
Render Samples: Render up to 4 x or higher than Blender 2.80 Cycles
Higher values = less Cycles noise but longer render times.
Viewport Samples: Distributes noise better across entire image.
Higher values = Finer detail, less Cycles noise but longer render times.