A friend is looking into some laptops and is wondering if the gt650m is worth paying $100 more for over an HD 7730m GPU? I looked up benchmarks and there's around a 20% difference in performance at high details and resolutions.
So you know how much it costs, and approximately how much of a difference in performance. Why are you asking US if it's worth it? Why not tell your friend he can get about 20% better performance in games for an additional $100, then ask him if it's worth it TO HIM?