It is all about performance. If you want a quad-core Intel Core i processor and a brilliant display, you want the all-new MacBook Pro. Every new MacBook Pro 15" features a quad-core Intel Core i7 2.7 GHz processor (compare to i7 2.6 GHz in the MC975(6)LL/A models), making them up to twice as fast as previous MacBook Pros. They also feature Thunderbolt, the next generation of I/O with data transfer rates up to 10Gb/s.The new integrated Intel HD Graphics 4000 processor makes it the perfect solution for the latest 3D games and graphics-intensive applications. It gives you a smoother, more fluid experience than before. It is still highly efficient, too, so you get long battery life when you are out and about. All in a precision aluminum unibody enclosure that is less than an inch thin.