Front Side Bus (FSB)
Front-Side Bus (FSB) is an interface between microprocessor core and other computer components, such as memory, peripheral devices and other microprocessors. FSB is often called a "system bus". Microprocessor performance highly depends on the speed, width and latency of the system bus:
Please note that buses of many modern microprocessors utilize dual-data and quad-data rate transfers, which effectively doubles and quadruples bus speed. For instance, the bus of first Pentium 4 microprocessors was clocked at 100 MHz. Because the data could be sent 4 times during each bus cycle, the bus effectively worked as 400 MHz bus.
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