Can't Overclock past 3.4 ghz

My e8400 is at 3.4ghz and whenever I start my computer up with any ghz higher it starts with black screens turns off then back on on 3.4ghz. Then when I go to bios it says unable to start due to overclock. All my stuff is on Auto in bios.
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More about overclock past ghz
  1. Sounds like vCore may be set to low
  2. Cool I'll try
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