Colour Managed Workflow for ICVFX/LED wall

I’m working on calibrating for our LED Volume, and wanted to know if anyone knows exactly what the Color Accuracy Mode settings in nVidia Control Panel control? and more importantly, is this the right choice?

I believe that we should be using “override to reference mode” so that nVideo CP does not apply any processing – but I can’t measure any change to my display when i toggle the options.

is this because i don’t have an OCIO config or otherwise being applied via nVidia CP so there is processing by no colour space translation?

would appreciate any insight on this black hole in my understanding.