Ok, the only settings you need to worry about are in BIOS; ignore the software overclocking software in Windows. Minotaurtoo's OP explains what general settings work for higher end ASUS BIOS, which your board is equipped with.
If you've made any changes to your BIOS already, go back in and reset to optimal defaults. Once that's done.......
1. Click on the "Advanced" tab in the main BIOS screen.
2. Once there, click on the "AI Tweaker" tab .
3. In there, select the D.O.C.P. option in the "AI Overclock Tuner" section.
4. Now, scroll down the page to the D.I.G.I. Menu, and click into it.
5. Once in this sub-menu, set CPU LLC option to high, and CPU NB LLC option to high.
6. Then, back out of the sub-menu, into the main D.I.G.I Menu you were just in. Scroll down to the CPU and NB Voltage section, and select Offset Mode section.
7. In the Offset Mode section, select just the CPU Voltage option, and set this option to negative (-). Below this section should be the Offset Value section, which you can start out at 0.1, *if* you are keeping the clocks stock. If so, save these settings in BIOS and exit. System should be stable, but remember that every CPU and motherboard varies in abilities.
8. If undervolting and overclocking, you'll have to play around with the bus speed clock and/or CPU multiplier setting. You will also have to select a less extreme Offset Value, such as 0.03 or 0.025. For my rig, CPU is currently set to 210 FSB, 20.5 multiplier, but "only" managing a ~0.025 undervolt. YMMV.