The PS4 also has an internal PSU, the Xbox uses an external power brick.
The PS4 will be very well engineered. Sony knows how to build a console, only this time around its been engineered around a more user friendly architecture.
The cooling systems for the PS4 will be very elegant I’d suspect and each component will be placed in perfect harmony with other components to ensure good airflow and cooling whilst the overall size doesn’t suffer.
The xbox one is a bit of joke really when you look at how big it is and it also has an external power supply. I was very surprised when MS showed the xbox one, it was just so big but clearly MS want to avoid failures and from what I’ve seen of the insides of the xbox one its got a huge fan which explains some of the size.
MS leaving the power supply out also means less heat generated inside the actual box, I think MS played it safe on this one. Sony however have engineered a very compact next gen console but played it safe with the way you can play your games.
Well played Sony, well played.