The main control chip is the core component of the motherboard or hard disk. It is the bridge between various devices and the brain that controls the operation of the devices. In the motherboard, the two chips are the most important. One is Nanqiao chip, which controls the expansion slot, USB interface, serial port, parallel port, 1394 interface, VGA interface, etc. it is mainly responsible for the connection between external interface and internal CPU. The other is Beiqiao chip, which controls the type of CPU, bus frequency of motherboard, memory type, capacity, graphics card, etc.

　　The main control chip of the motherboard is generally the north bridge. The south bridge chip is responsible for the communication between I / O buses, such as PCI bus, USB, LAN, ATA, SATA, audio controller, keyboard controller, real-time clock controller, advanced power management, etc. the north bridge chip is responsible for the connection with the CPU and controlling the memory. The north bridge is the most important part of the motherboard chipset, generally speaking The name of the chipset is named after the name of the north bridge chip. For example, the north bridge chip of the Intel GM45 chipset is G45, and the new one is the north bridge chip of the X58 series that supports the Core i7 processor.