Overclocking is an art, and there are no guarantees. For example, some CPUs may overclock greatly (700Mhz Pentium III at 143FSB), but unfortunately, there are many others that do not perform as well with respect to overclocking. Anyway, you probably have a higher chance of hitting 133Mhz FSB on a 700Mhz Pentium III than on a 750Mhz Pentium III. Good luck!