"Soft FSB is a very useful utility that allows us to change the function frequency of system bus and also the CPU from Windows without having to go into the BIOS. Even though this is very good because you can try different speeds and find out your system's abilities, it is not the only thing you can do."
FULL STORY @ TECHDUNGEON (http://www.techdungeon.com/overclocking/articles/2000/softfsb/index.shtml)