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SOUTHBRIDGE Definition We define SOUTHBRIDGE SOUTHBRIDGE - Part of a chipset in a PC that controls communications between among the PCI bus, IDE controller, BIOS, USB, power control, and PS/2 ports. See also northbridge. You must pair a northbridge and southbridge chip to create a full chipset. # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z