PC starts and shuts down twice, full boot on third try (only when OC'd)

PC does as stated in the title. I've read that it could be caps on the MB among other things, but can’t find and bad ones on mine.

The strangest part to me is that it only happens when I OC my CPU, boots normal at defaults. I actually thought maybe with all my recent upgrades a larger PSU would help, but it still does the same thing.

Any help or ideas would be great.

Specs are:

CPU AMD FX-8320 3.5GHz 8-Core @4.7
CPU Cooler Cooler Master Eisberg 240L Prestige 60.2 CFM Liquid
Motherboard Gigabyte GA-990FXA-UD3 ATX AM3+
Memory Mushkin Redline 8GB (2 x 4GB) DDR3-1866
Storage Samsung 840 EVO 120GB 2.5″ SSD
Western Digital Caviar Blue 500GB 3.5″ 7200RPM
Video Card HIS Radeon HD 7870 GHz Edition 2GB
Power Supply EVGA 850W ATX12V / EPS12V
Optical Drive Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Operating System Microsoft Windows 8.1
Case Fan Corsair Air Series AF120 Performance Edition (2-Pack) 63.5 CFM 120mm
Corsair Air Series SP120 High Performance Edition (2-Pack) 62.7 CFM 120mm

sounds like your OC is a little high. turn down the voltage, and ghz if you have to. make it stable. 

i let my overclocks run for 24 hours plus stress testing to see if they're stable. just because your computer turns on doesn't mean you're doing it any favors by pushing that cpu so far. 

i have an 8350 OCed to 5.1ghz. if i try to push it to 5.2 i get very similar issues to what you're having.

Are you manually OC'ing or using software to OC?

This usually happens from a bad OC. The third reboot is usually it reverting to stock voltages most modern bios-es go into a safe mode and set stock freq.

Manual OC. If I remember right it started doing it as soon as I touched the clock speed. I'll try going milder and see if that makes a difference. Once it boots it's at my set OC and voltage and is 100% stable. Thanks for the suggestions. I'll mess with it my next day off. 

back it off to lets say 4.8Ghz. and try if you have any problems then.

How did you overclock? multiplier or northbridge?