Based on previous overclocking experiences, we adjusting the settings for all overclocks as follows:
CPU Core VDroop Offset Control: +100%
Digital Compensation Level: High
CPU Core OCP Expander: Enhanced
CPU Core Switching Frequency: 2x
Power Limits: 255W
Maybe you need to up the power limit
Also it seems very finicky according to HardOCP
http://www.hardocp.com/article/2012/11/28/msi_z77_mpower_lga1155_motherboard_review/7#.Ua6ROpxGZmMEdited by AlphaC - 6/4/13 at 6:22pm
Overclocking the Z77 MPower was definitely a unique experience. Normally I can take most Ivy Bridge CPUs to about 4.3GHz or 4.4GHz using automatic settings. After that I have to start adjusting the CPU voltage, increase CPU PLL voltage, set load-line calibration, and in many cases manually set the power phases to a full duty cycle. I wasn't able to do that. At 4.2GHz I had to begin adjusting the CPU voltage. I had to take it to 1.2v and that was sufficient up to 4.6GHz. I started tweaking load-line calibration and other variables as I always do in order to reach for 4.7GHz and beyond. At that point I was working with a stable system using 1.2v CPU voltage, CPU PLL overvoltage, and 1.85v CPU PLL voltage which is less than I normally have to run on most boards. Everything else was on automatic. Unfortunately anything else I changed, Load-line calibration, power phase control, etc., caused no POST conditions or in many cases blue screens when I got into Windows and tried load testing the system. Base clock adjustments of any sort caused me nothing but headaches, usually resulting in a no POST condition and the UEFI recovering on its own. Normally I can get a BCLK frequency of 101MHz or more. Not in this case. It wanted a setting of 10000KHz and no more. And as I said earlier in the BIOS section, the board always ran with a 100.53MHz BCLK even if set to 100.00MHz.
CPU PLL voltage and CPU core voltage were the only things that I could actually adjust and maintain system stability. After I decided to leave most of the BIOS settings alone all I had to do was dial in the right CPU voltage which would give me stability and keep my thermals in check.