The south bridge is generally located on the motherboard far below the CPU slot, near the PCI slot, this layout is to take into account that it is connected to the I\/O bus more, far away from the processor is conducive to wiring.
The North bridge chip is the closest chip to the CPU on the motherboard, which is mainly due to the fact that the communication between the North bridge chip and the processor is the closest, and the transmission distance is shortened in order to improve the communication performance. The difference is that the North bridge chip is a chip located near the CPU slot, which is generally covered with heat sinks. The south bridge is far below the CPU slot, and most do not have heat sinks.