Overclock in BIOS.
As noted software overclocking is subject to problems including AOD. It's always better to OC via the BIOS if you understand what changes to make. Guessing on BIOS adjustments can make your PC unusable so it's best to learn what to change and what not to change. The unlocked FX CPUs can be easily OC's by changing the CPU multiplier which should be explained in your mobo users manual. You will need to go into "manual" mode to change the CPU multiplier. Only increase the multiplier by .5 increments and check stability.