Short for Front Side Bus, FSB is also known as the Processor Bus, Memory Bus, or System Bus and connects the CPU (chipset) with the main memory and L2 cache. The FSB can range from speeds of 66 MHz, 133 MHz, 100 MHz, 266 MHz, 400 MHz, and up. The FSB is now another important consideration when looking at purchasing a computer motherboard or a new computer.
The FSB speed can be set either using the system BIOS or with jumpers located on the computer motherboard. While most motherboards allow you to set the FSB to any setting, ensure that the FSB is properly set unless you plan to overclock the computer. Keep in mind that improper settings may cause issues such as hardware lockups, data corruption, or other errors may arise with older hardware (e.g. SCSI cards). Verify your component's compatibility with your motherboard and FSB speed.