Please understand what I am asking here. I'm not asking how much RAM can theoretically be apportioned to a single VM in Hyper-V, that's 1TB. What I'm looking for is a figure or formula showing how much a given host with xGB of RAM can apportion to a single Virtual Machine via Hyper-V, since no hypervisor is able to give 100% of itself to any guest.
Are the requirements fixed – ie, does Hyper-V always require xMB and from there anything goes? Or is it always a percentage of the Host's RAM? How does video memory factor in? I don't mind if the results are a bit give-and-take – it'd be ridiculous to expect exact figures down to the megabyte – but any ballpark indication would be immensely useful.
I'm not concerned with multiple VMs at this time. Let's work from the assumption that this is the only device being virtualised.