Lower your voltage.....
Is that high? What would you say is an acceptable voltage?
For 4.6 on a 2500K, you should be in the 1.34-1.37 range (1.37 is high, itself, but if you have a worse than average chip, you may need that much. 1.392 is WAY too high for 4.6, though).
Alright thanks guys. I'll have to change that asap.
I'm curious as to how you arrived at 1.392v in the first place you should be able to run 4.6 stable at around 1.355v with a single GPU and around 1.365v for an SLI or Crossfire setup in Win7 64bit, even for a worse performing 2500K.
DJD has given you some good advice showing a range of 1.34v ~ 1.37v, but what you really should do is drop to 1.30v and begin testing your 46x multiplier from there and increase the voltage one bump at the time until you're boot stable into the operating system, then continue testing for stability using stress testing and continuing voltage increases one bump at the time until you reach illusionary stability.
Illusionary stability is what is required to post here in the Intel Overclocking Club thread.
What I mean by that remark is Prime95, IBT etc. is not a solid stability guarantee, because they do not test graphics load, passing them may get you in the overclocking stability requirements to post in this thread, however you may crash in the first game you play.
To truly be 100% stable you need to expand your testing for stability adding a Graphic and Sound load to the mix, Graphic by running some benchmarks like 3DMark Vantage or 3DMark11, and then game adding the sound, if you're 100% stable you'll be able to game for hours with no problems, but if not you'll understand what I mean with the stress testers leaving you with false stability.
Gaming like 3D environment gaming along the lines of a First Person Shooter, sometimes will crash instantly if you're not 100% stable, and if you crash in a game but think you're stable because of IBT or P95 has left you confident you're stable, well you're not stable, that's why you're crashing in the game.
That's assuming of course after all your booting and rebooting and voltage changes to reach stability, you've uninstalled and reinstalled your graphics drivers that almost assuredly you've corrupted, in the boot and reboot quest for stability.
After posting in this thread, what then?
You have to reach a little beyond the stress testing for solid stability, and you have to reach solid stability one step at the time until your little testing train arrives at "Stability Station"!
All Aboard! Ryan
FYI; I'm not trying to offend you, I'm trying to help you.
Personally for longevity I suggest you drop to 45x around the 1.325v area anyway, because you'll use even less voltage, and lower your CPU load temperature, which is very important in overclocking the 2500K with an air cooler anyway, and at 4500mhz the 2500K will do whatever you require of it.