Native 4K or Checkerboard "uprendered" 4k

[mutantsushi]

Conina said:

The PS4 has a lot of RAM? For ultra textures?   Games can only use 5 GB of the 8 GB.
These 5 GB unified RAM aren't reserved for the game's graphics alone, the whole rest of the game uses a part of this RAM, too.

PS4 NEO is making 500 MB more RAM available to games.  Unclear why this isn't available to PS4 OG/Slim, as they didn't increase physical RAM.