http://www.eurogamer.net/articles/digitalfoundry-ps3-system-software-memory
PS4 to have up to 5.5GB RAM for games apparently. It could be true but I call bullshit because they are using a Guerrilla Games KZ: SF slide from the February demo as a source. Maybe that's why Sony is gonna make a comment to set them straight yet again.
Thread for it here: http://gamrconnect.vgchartz.com/thread.php?id=165295