"On almost all Intel chips, it is not possible to change the multiplier. This is
because some people remarked the casing on chips so they ran faster, and then these
got sold and a large profit was made. Now Intel has put a multiplier lock on CPUs
so that the motherboard reads the multiplier off the CPU and it can't be changed."
FULL STORY @ NETKILLS (http://netkills.qgl.org/a_oc_comp.shtml)