The northbridge, also known as a memory controller hub (MCH) or an integrated memory controller (IMC) in Intel systems (AMD, VIA, SiS and others usually use ‘northbridge’), is one of the two chips in the core logic chipset on a PC motherboard, the other being the southbridge.
The southbridge, also known as an I/O controller hub (ICH) in Intel systems (AMD, VIA, SiS and others usually use ‘southbridge’), is a chip that implements the “slower” capabilities of the motherboard in a northbridge/southbridge chipset computer architecture.
The southbridge can usually be distinguished from the northbridge by not being directly connected to the CPU. Rather, the northbridge ties the southbridge to the CPU. Through the use of controller integrated channel circuitry, the northbridge can directly link signals from the I/O units to the CPU for data control and access.
source:wikipedia
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