The PS4 is an example of that. It's an APU with GDDR5 acting as both system and video memory. To be honest for a while I thought that was where everything but

The PS4 is an example of that. It's an APU with GDDR5 acting as both system and video memory. To be honest for a while I thought that was where everything but servers would be going. You can tune your OS and applications around the slower GDDR5 and it seemed a no brainer: instead of 8GB of system memory topping out and then 4GB of VRAM doing jack shit you could have 12GB that could be dynamically assigned to whatever you wanted! Alas, that dream was never meant to be. Edit: I posted about this a while a back and apparently Arch Linux has a hacky way to use your VRAM as system RAM. Good stuff.