In describing its new "A5x chip with quad-core graphics," Apple obscures the fact that the CPU is exactly the same as that of the iPad 2's A5 processor, as confirmed by Engadget. Only the GPU got a boost, mostly to serve the new Retina display and high-end 3D games.
The Hardware's a Bit Thicker and Heavier
To make room for the iPad's bigger battery, which was necessary to power the Retina display, Apple had to add an extra 0.11 pounds and and 0.03 inches of thickness to the new iPad's frame. Otherwise, the design is fairly similar to last year's model.