first off, the board has hidden settings for overclocking. You have to go to the advance cmos options, then cpu options, hit f4, and disable the C1E and then go to the top right option in the main bios and you turn off the intel thing. Then go to the drop down menu that gives you the auto/linked/manual options. Click manual.
The only things you will need to edit are the FSB, which is quad-pumped. If you want say... 2.8GHz on an e6400, then you take 2800 / 8 x 4 = 1400 = FSB
Be forewarned, my FSB will not boot at over 1500.