The front side bus connects the CPU on the motherboard to the Northbridge. Front side bus speed is in preference to how much data can move across the bus simultaneously, and is measured in megahertz.

The bus between the CPU and memory on the motherboard. Also called the memory bus, front-side bus, local bus, or host bus.

The backside bus is 32-bit wide and the front side bus is 64-bit wide. This because of the dual processing design.

front side Bus...(FSB)

or

System Bus

The Front Side Bus (FSB) connects the processor (CPU) in your computer to the system memory.