At a FSB of 100 MHz the multiplier is changed from x7.0 to x9.5. The core voltage has to be increased as well, of course. Here the L1 bridges on the processor surface are open. These are the better overclocking CPUs - the L1 bridges are closed. You can close the open L1 bridges on the first CPUs fairly easily.
Silver conducting paste does the trick, and it is available in electronics stores.
With a little bit of skill everybody can do that. Let's now take a look at our favorite overclocking boards. The Front Side Bus can also be changed. The Abit KT7 is clearly our favorite. As a second candidate the Asus A7V is quite convincing.