EDIT: I just re-wrote my entire post.
On a non "K" 2600, the maximum achievable frequency is 4.2 GHz (if your lucky).
You CAN change OC to the max turbo boost frequency. Then, you can bump your BCLK up as well.
You will have to bump up the VCORE as you increase the BCLK. Do not exceed a 1.4V Vcore. If your changing Vcore, you need to do stress/stabilty testing while monitoring temps to ensure it's stable and cool.
Bumping up BCLK will cause PCI-E to be instability at a certain point.
The specific names of the options regarding turbo boost changes slightly from manufacturer to manufacturer.
What motherboard do you have? Even if your processor supports it, a Dell/HP/ect motherboard might hold you back.
Well, what options do you have in your BIOS??.....lets start there. I assume your new here, if you need help getting into your BIOS let me know.
Also, read this --> http://www.tomshardware.com/forum/274624-29-2600-overclocking-modelEdited by crimsontears809739 - 4/27/12 at 9:38am