The motherboard is a circuit board that the chipset plugs into or is soldered into. Along with hundreds of other components on a motherboard, it is the part that actually does the computing in a computer.
The purpose of the 770 Northbridge chipset on the motherboard is to link the computer system's hardware to the processor. Like other computer Northbridge chipsets, they act like the nerves that send signals to the entire unit. The 770 is lower power due to smaller connectors, which makes it an effective chipset.
The AMD 770 is a chipset used in computer motherboards. think of it like CPU is its brain, the chipset is the nerves in the spinal column. They don't do much on their own, but they're a necessary connection point between the brain and the rest of the body. The 770 chipset is the same.
The purpose of the motherboard for the AMD SB710 Southbrdge chipset is to control the processes that are going on within the computer's main frame system.