Machine Check Error

I have an Intel 2500K on an MSI P67A-GD55. I have gone up to 4.5GHz stable, but when I set the multiplier higher than 46x, when I get to windows boot I get this:
What voltage needs to be adjusted to help this, or what can be causing it?
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More about machine check error
  1. You can try increasing the CPU voltage, but it is likely that you have run into your CPU's multiplier wall. Each individual Sandy Bridge CPU has a certain multiplier that it cannot go past, and this is called it's multiplier wall. No amount of voltage or cooling or settings manipulation will allow it to go higher than its multiplier wall.

    For everyday overclocks, it's best to stay below 1.35v or at the absolute maximum 1.4v for CPU longevity. Also, keep the Prime95 load temps below 75ºC.
  2. I updated my MSI P67A-GD55 bios from v1.4 to v1.8 and now I can OC to 5GHz without a problem.
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