@Nightshade737
The 060 does not use a multiplier (or rather it uses a multiplier of 1x).
It's not like PPC or x86 where the CPU speed can be mch higher than the bus.
So a 66MHz 060 has a 66MHz bus to the outside world (that includes the memory). Clock it to 100MHz and the bus is also 100MHz. The point is that existing accelerators aren't designed for these high speed signals. 60/70ns SIMM RAM simply won't operate reliably at 100MHz.
-edit-
Matt beat me to it :-D