I would agree with Rubix's statement, but I would also add that there's no real reason for your to OC unless you just want to experiment. You're system is good enough that there won't be any noticable performance difference when gaming. For reference you can easily bump up your CPU multiplier to around 42-44 with all stock voltages. That will amount to around a 25% OC, but you're fps gains will likely be minimal.
Also, unless I'm nuts or my version is really old, Afterburner doesn't allow CPU overclocking. That needs to be done through the BIOS.