Apple Silicon M1 supports “billion of colors” a.k.a. HDR 10-bit output
One of my very first jobs I worked to test VGA cards.  They were 4mb and 8mb.  Yes you read that right, that is "m" as in megabytes.  My setup was a 25 megahertz open case motherboard, a few of these.  It was part of the last quality control station and I would pop each vga card into the PCI slot and boot it up.I would basically run a macro which cycle through the resolutions from b/w, 4 colors, 16, 256, ... and up to a million or so.   I think there is a name for this, but basically watching a prism of rainbow colors.  At a million+ the color tones are very smooth and you don't see an outline.I could not imagine I would be able to differentiate a billion colors from its previous factor.  At that point, I would stamp it and it goes off to shipping for packaging, and to the customers.