Note: Most FSB are measured in speeds ranging in the hundreds of Mz, although they are sometimes stated as 1332, 1600, etc. If so, divide by 4 to get the actual FSB speed. [The FSB on intel chipsets is quad pumped, hence the divide by 4 operation.]
On newer systems, the equation is simplified to:
333MHz * Multiplyer = CPU Speed
Note the only way to OC now is to change the Multiplyer, as there is no more FSB.