660m will have no bearing on mobile use, unless you are foolish enough to game on battery. Its going to be using switchable graphics, so it will default back to the Intel HD4000.
Alpha 65 Minolta 24/2.8, 50/1.7, 135/2.8, 70-210/4, 100-300 APO, 500/8 Sony 18-135mm SAM Tamron 28-75/2.8, 90/2.8 Macro, 70-300/4-5.6 USD, 200-400/5.6