Have you reduced the resolution? Your hardware should definitely be able to cope with high settings at 1920x1080. Just turn uber-sampling off, to be sure.
Are your drivers up to date?
The graphics performance of the GeForce GTX 775M should be almost identical to the GTX 680M, making it somewhat faster than the Radeon HD 7970M. The GPU has enough power to run demanding games of 2012 and 2013 fluently with Full HD resolution and maxed out graphical settings. Only extremely demanding titles like The Witcher 2 will not run fluently in ultra settings. Battlefield 3, Skyrim and Crysis 2, for example, are playable at the highest detail settings.