That depends a lot on the game. If the game is CPU intensive then the FX processors are really lacking in that area compared to Intel. If the game if GPU dependent then the video card could limit you depending on the monitor resolution.
For the price that is a good setup.
Maybe in some old games - single threaded only but the bottleneck shouldnt be much . Dont worry , at any time you could overclock FX 6300 . This pair is not bad .