At the speed you have it chances are very small that it'll bottleneck anything, unless you play at low resolutions.
You can probably push the chip even further. Anything below 1.55 vcore is considered safe, and you can go to at least 62 degrees. Some people say 70, but stick to 60 just to be safe. Above 4.5 GHz power consumption increases a lot though, so you can leave it where you are if you don't feel the bottlenecks.