non K version are not overclockable.
Half and half, Celeron/Pentium/i3 chips ar locked, non-K series i5/7's are partially locked, you can OC them by up to 400MHz over their max turbo (plus whatever you can get out of the BCLK) so for the i5 3570 non-K its a max of 4.2-4.3GHz depending what you do with the BCLK, not exactly something to write home about, although it could be enough to outperform an overclocked FX-6300 maybe...
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