In fact, there is no motherboard without the south bridge, now most of the north and South bridge chips integrated together, North Bridge South bridge is the most important two chips on the mainboard chipset, North Jiaotong University is mainly responsible for the data exchange between the CPU and memory, and control agp PCI data in its internal ripe is the main determinant of motherboard performance. The South bridge chip is mainly responsible for the control of some peripheral interfaces such as IO interface IDE device control and additional functions.