> That also led me to research why a card with only 12GB of VRAM is requesting a 16GB BAR, and as far as I can tell, it has something to do with potential uses like SR-IOV where multiple VMs could access a single device, thus requiring more BAR space for the physical device being shared... BAR is still a little bit of a mystery to me.

Lengths of BARs have to be powers of two.