 Consequently, the maximum memory capacity was also doubled (to 16GB), and for Intel Core i-series (27-inch), quadrupled, to 32GB.The 27-inch models of the line became the first to offer Target Display Mode, allowing the iMac to be used as an external display for another Mac computer when connected via Mini DisplayPort, a feature that was extended to the 21.5-inch models onwards with the introduction of Thunderbolt.The Late 2011 Unibody iMac is also the last model to include an internal SuperDrive.