To really be able to give you much help, we'll need to know your system specifications.
Meanwhile, take a look at this:
https://www.youtube.com/watch?v=MckeAmnDeTk
Since not all BIOSes are the same, you'll have to extrapolate, if you don't have an ASUS-based motherboard.
I used to have an FX-4170, which was just a factory overclocked (4.2ghz) FX-4100. I could get to 5.0 ghz with it, but 4.6 was all I could realistically manage for a 24/7 overclock.