Start with a 5mhz increase in fsb from stock. Run OCCT or Orthos, (if it is Orthos make sure you do it for at least 2hr for a quick stability test, 8 hrs+ for full stability test). During this process watch your 100% load temps to ensure they don't get above lower 70's at most. If you find instability then up the voltage a little bit and repeat until you can't go any higher.
Follow this basic process and you should avoid this issue.