What's Inside a Computer?
What's on a Motherboard?
Northbridge & Southbridge
The Northbridge (also known as the host bridge) is one of the two chips on a PC motherboard. It is connected to the CPU, unlike the Southbridge. The Northbridge communicates with the CPU using FSB (front-side bus).
The Southbridge is a chip which connects the Northbridge to networks, hard drives, USBs and other components inside a computer. It sends data to the CPU and receives data as well.