I have found that with the FX chip a combination of increased FSB and Multiplier yielded the best and most stable results for me. Just keep in mind that the FSB will affect RAM, NB, HT, CPU.
First you want to turn off any power saving options prior to OCing (you can turn them back on later). Then slowing start increasing Mulitplier and FSB. If you turn the LLC up to high or extreme you should probably get somewhere around a 4.1-4.4ghz overclock without really touching the core volts. Remember to set most of your settings to manual, even if you don't actually adjust the settings (i've found that this has helped in the past).
After that it just becomes the slow methodical process to find the highest clock with lowest volts for stability. I wouldn't push core volts past 1.4v on that chip, lower would be even better. depending on your RAM speed you may need more voltage as well. good luck