Maybe this will help. http://en.wikipedia.org/wiki/CPU_multiplier
Anyways, a system's FSB speed (200 is what mine is by default) is multiplied by the CPU's multiplier (mine is 14 by default) which would give me 2.8Ghz. So if I up the FSB to 250 and leave the multiplier at 14 would give me 3.5Ghz, etc.
I think I got that right.