So xbox720 is reserving 3 gig for the system, leaving 5 gig for the game. What's the ps3 system overhead? Assuming its a paltry 1 gig, that leaves 3 for the game, still 2 gig under.
That's quite the deficit and could lead to porting issues just like this gen. I can see how Sony needs to be cautios in the regard.
It wont due to the bandwith of the better ram in the ps4.