I would go into BIOS, change your CPU multiplier to 17x, then save and exit. This will bring you from 3.2GHz up to 3.4GHz. If it runs with no problems for a few days then bump it up to 17.5x wait a few more days, and then 18x. If you machine starts having problems then go into BIOS and dial it back by 0.5x
Be sure to keep an eye on your CPU temperature. I know you have a good cooler, but it doesn't hurt to check.