Yesterday I overclocked my i7-4930k to 4 GHz and set the CPU voltage to 1.2v. Twice today my PC would not shutdown when all I wanted to do was turn it off. First I clicked on shutdown in Windows 8.1 but instead of shutting down my PC restart. Then I pressed the power button but my PC restart again to my system password prompt. Then I pressed the power button again and my PC finally shutdown. Also I had the CPU load line calibration set manually to Regular. I also ran Prime 95's small fft test for 17 hours straight without issues and Intel Burn Test at very high memory setting and 100 runs without issues and I played Crysis 3 without issues so far at 4 GHz an 1.2v vcore. Does this sound like my CPU can't handle 4 GHz at 1.2v vcore or that it has something to do with the CPU's load line calibration that I set it to?