Group, traditionally at least two chips, the south bridge and the north bridge.
For example, the P45 motherboard, the north bridge is the Intel P45 chip, the south bridge is the CH10R chip
Another example is the AMD970 motherboard, the north bridge is the AMD970 chip, the south bridge SB950 chip
The Northbridge chip connects to CPU sockets, memory controllers, memory slots, PCI-E controllers, etc
The Southbridge chip connects to the disk controller, and those slot jacks, etc., SATA, PATA, USB, PCI, and so on
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With the progress of technology, the current north bridge memory controller, can be integrated (integrated) into the CPU inside, so the north bridge only left the CPU socket and its power supply inductance capacitor, no chip, so that the motherboard is a single south bridge chip, the concept of chipset has since lost meaning, the concept of a single chip.