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That's the chip pairing that allows 8 GB of GDDR5. I don't think any GPU needs to do that yet. Oh, maybe the 6 GB GPUs do.
http://www.wired.com/gamelife/2013/11/playstation4-teardown-video/
Video - wowsers, that's confusing as hell
Lower pants before you do that; that video is pure hardware porn... (Insert pun about motherboards and prongs here.)
To be fair, sony consoles have been this elegant since the PS2, and PS3 especially, which also largely followed the same overall principles, with its directed airflow and single radial fan and so on.
It's certainly a lot more inefficient with the use of space inside the console. What it may have over PS4 is a much larger diameter fan, which could potentially mean lower sound levels, I haven't seen any reports about that yet. PS3 Slim had lower heat output, but also a much smaller fan, meaning sound level - and especially frequency - actually increased, meaning a less enjoyable overall experience near the device. This is my one concern right now regarding PS4. When gaming I don't really notice my PS3 Slim's fan, but when watching movies I sure do. Of course, PS4's power saving features are radically more advanced, so fan noise during movie watching should not be an issue methinks. Gaming, though, I've no idea. If the APU puts out upwards of 150W of heat, then the fan ought to be fairly audible during gameplay, as evidenced by various videocard coolers and also PS3 Slim etc.
Don't be ridiculous, it would have been larger overall with the external brick. You'd also needed a thick, unwieldy power cable leading to the console and a big unsightly brick of hot plastic on the floor. The internal PSU in PS4 is tiny as we can all see, and occupies what would essentially have been mostly dead space inside the casing...
