“The other exciting thing is that Windows for most people is tied to about 2GB of addressable memory space. This really opens up beyond what most PCs can do, because most PCs are running a 32-bit version of Windows.”
Last I checked the PS4 is using unified GPU/RAM and a semi-modified APU so they will juggle between GPU RAM and system RAM a lot.
***EDIT
Also would like to know how much of the engine is being limited due to the hardware of the PS4. It's so easy to render a time demo, just saying.
Found my answer:
