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.