FX-6300 Overclocked @4.3Ghz

[Bamse]

Well hello there! I got my FX-6300 not so long ago with a cooler (Cooler Master Seidon 120V) and I just want to tell you guys that this was the best purchase in my life! I overclocked my CPU to 4.3Ghz and tried even further, to 4.4Ghz it worked and I ran Prime95 for 10-20 mins with no errors what so ever, then I tried 4.5Ghz and after some seconds in Prime95 it started spamming ''Possible hardware damage!'' then I immediately restarted my PC and went into BIOS to change it down to 4.4Ghz, went into Prime95 just to be sure, then after some seconds it came up with an error exceptional to the error before, then I backed down to 4.3Ghz and it's all working fine.
What happened exactly?

 

[logainofhades]

Might not have been enough voltage for the overclock.

 

[Bamse]

The problem is that i can't change the voltage, my bios does that automatically, sometimes it goes down to 1.4ghz and 3.0ghz.