Not to much. A bit on some poorly optimized games (like skyrim and it's ability to only handle two cores.)
However, it seems to be more futureproof. In games that use 4 or more cores, and for basically any multicore process, it can hold it's own against an i7. I would say that, overall, it is on par (or a bit better than) an i5 for games and everyday use.
You just answered my question AND made me feel better about my purchase! Thanks!