CPUFSB is a small version of CPUCooL. It is for changing the FrontSideBus only. So you have a small tool only one of the the most important freatures of CPUCooL. Changing the FrontSideBus enables you to set the frequency of your CPU up to the limits. Further developement is stoped. Please have a look at cpucool and you will find all functions of CPUFSB integrated in CPUCooL