SetFSB is designed exclusively for advanced users who want to get more use out of their hardware than the default capabilities permit. Heed the limitation warning, because it could severely damage your system if you try to use it without the proper knowledge necessary to do so.
For those who do now how to use it, it offers adjustments of the Front Side Bus of the system. The speed of the program goes from 60-400 MegaHertz. The program is designed for overclocking, i.e. modifying the FSB to a higher speed.