Umm. There are these things called 'Textures'. 
so it's more than just pixel space. Sorry, couldn't resist a snarky response.
Anyway, what I'm seeing is that textures do not have enough space to load in for detailed CAD, rendering, and game development work. Native function on 24GB or more cards I don't see this. This was similar back when I had to move from 4 and 8GB native cards to ones with larger memory. Since workstation *appears* to be using the host's physical ram as a shared memory buffer that then ?maps that? to the host's gpu figure it would be possible to allow a larger reserve space for that mapping. I mean it is relatively easy to have a host that has 256GB or more ram in it so to dedicate say 64GB ram to a guest (32GB for shared memory) for an example, is not really a hardware issue.
So was just trying to see if there was a way remove or expand the software limit.