As I understand it, DX12 is supposed to allow sharing of video card resources. Does that mean that you could buy and drop in, say, an old 700-series card with 2GB of DDR5 and get a video memory boost for cheap? Or would it be better just to get more main memory and let video memory spill over into that? Obviously it would only help with DX12 games specifically designed to take advantage of the feature. It will probably be some time before one of those exists. Still, I'm curious how this memory sharing thing is supposed to work and what cards are likely to work better than others.