Since you're on intel the performance difference between 2666 and 3200 won't be as significant as it would be if you were using an AMD CPU, but you should still see difference in performance nonetheless, it can be a difference between 5-15 FPS depending on the game. So up to you if it's worth it.
Since you're on intel the performance difference between 2666 and 3200 won't be as significant as it would be if you were using an AMD CPU, but you should still see difference in performance nonetheless, it can be a difference between 5-15 FPS depending on the game. So up to you if it's worth it.