ASUS Zenbook UX51Vz (2013)The Zenbook UX51Vz's 4.6-pound, 15 x 10 x 0.2~0.8-inch frame is lighter and slimmer than the Samsung ATIV Book 6 (5.4 pounds, 14.75 x 9.8 x 0.9 inches). The Zenbook features a 15.6-inch 2880 x 1620 IPS display that is almost on a par, pixel-wise, with the 15-inch MacBook Pro with Retina display (2880 x 1800). The laptop's 2.2-GHz Intel Core i7-3632QM CPU is powerful and duly supported by Nvidia GT650M GPU with 2GB of video memory. Outfitted with Nvidia's Optimus technology, the ASUS Zenbook UX51Vz switches automatically from its discrete GPU to integrated Intel HD 4000 Graphics to conserve battery life. Still, the Zenbook lasts for just 4 hours and 38 minutes.