In some benchmarks I've seen, the 650ti-B was better in some games than the 7850. I'm not sure about what "superclocked" really does for it, but assuming it boosted it's performance even more, then that would be nice. They are close, so just go for either the cheaper one, or if you want a specific feature (like nvidia supports physX for example where amd does not). I have a 650ti-b and it does everything I need it to and it was fairly cheap.