Exactly why do you want to OC your CPU?

You do know it's not going to give you a huge performance difference right? You need to do your research on overclocking plus your own CPU. Make sure you know what you are getting yourself into. Overclocking isn't an easy/cheap solution to increasing performance. It's an enthusiasts thing. You need to be aware about what it entails to your system.

You already have an X4 and most games are GPU intensive. Just how much of a difference do you think it will make? Again make sure you know what you are getting into.