Thanks to the dual Thunderbolt ports and new HDMI connector in the Retina display equipped MacBook Pro, for the first time ever, a MacBook can power three external displays. Other World Computing today posted this image of a new MacBook Pro powering three high res displays, all at native resolution. This is quite an impressive feat, especially for a mobile video card.
The Retina MacBook Pro Can Push 15 Million Pixels Across Four Displays