What is 24 pin SMPS connector

This 24 pin SMPS connector is designed with ATX style of power connectors. This connector is used to provide power supply to the motherboard. Therefore, it is known as PC main power connector. The 24 pin SMPS connector has 4 additional pins that carry a different voltage level than the 20 pin connector. Pin number 11, 12 and 23 respectively +12 V, +3.3 V, +5 V and pin number 24 are used as ground.