Short for Memory Controller Hub, MCH is an implementation of the Accelerated Hub Architecture (ACHA), this is the faster end of the ACHA, often referred to as the Northbridge, a reference to the older three-tier chipset design. The MCH provides the system bus interface, memory controller, AGP interface, and hub interface for I/O.
[Image Source: INSIDE THE PC, Nigel S. Smith, University of Cambridge Computing Service]
