![]() ![]() The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The older 20 pin main power cable only has one 12 volt line. The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. ![]() Standard 4.2mm Pitch ATX Header Connector Datasheet
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