It is now possible to choose frequencies between 66 and 133 MHz.
Only 120 is usable, as 133 crashes the machine. Additionally the system does not report the proper frequency :(
Keep in mind that processor will accelerate proportionally! So a 400 MHz CPU will run at 480 MHz with a bus speed of 120 MHz, if it can run that fast.
http://www.xlr8yourmac.com/systems/sawtooth_bus_overclock/sawtooth_bus_overclock.html
