MacBook Pro 15-inch Retina Virtualizing Windows
November 7, 2012 – This is the rMBP virtualizing Windows XP with 512 MB of RAM; Windows 7 with 1GB of RAM; and Windows 2008 R2 Enterprise with 4GB of RAM….all at the same time! While still performing a audio/video screen capture in the full retina resolution of 2880 x 1800 pixels. Insane!
Source: MacBook Pro 15-inch Retina Virtualizing Windows (Youtube).