I suspect that the Intel HD Graphics 4000 built into the CPU will not be used very much at all, with the Nvidia GeForce GT 650M doing most of the graphical processing.
With 4x the pixels, the Retina Display is really going to tax the graphics processors.
To get the Retina MacBook Pro down to 0.71″ thin, Apple had to move to a smaller MagSafe power port (MagSafe 2), and because the higher resolution display requires more power, much of the space saved by eliminating the hard drive and SuperDrive has gone to batteries. Part of the difference is the screen, but a big part is the fact that this is an exclusively SSD machine, and SSDs are more expensive than hard drives. At the high end, the 2.6 GHz Retina retails for $600 more than its non-Retina equivalent. Where the basic 2.3 GHz quad-core i7 MacBook Pro retails for $1,799, the Retina model sells for $400 more. Of course the big feature is the Retina Display, which has a whopping 2880 x 1800 pixels at 220 ppi – the highest resolution display ever in a notebook computer. Start with the base specifications of the latest 15″ MacBook Pro, remove the built-in SuperDrive, replace the hard drive with an SSD, and then trim almost 1/4″ from the already thin model, and you’ve got the core of the Retina MacBook Pro (to shorten the name slightly).
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