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24 pin connector is required to supply power to the motherboard.
the regular ATX has a 20 pin power connector, while the enhanced ATX power connector has 24 pin power connector.
The purpose of a 4-pin auxiliary connector on a motherboard is to provide an additional 12V power supply to the processor.
Power input connector, or just power connector
Power input connector, or just power connector
To provide power to a circuit board or fan
AUX
The atx 12 connector is one of the motherboard power connectors and used for 12 volt power connect for cpu voltage regulator.
Many/most motherboards have a separate power connector for the CPU. Check your motherboard's installation instructions to locate the CPU power connector. Then connect the matching power supply cable to the CPU power connector on the motherboard.
There are no differences between the power connector of an AT motherboard versus that of a BabyAT motherboard.
20 pin P1 connector.
24 pins