Antec TPII-550 12V 550W ATX Power Supply Single 120mm low noise fan Dual 12V outputs, for stability and safety True Spec noise level of 21.3 dBA measured at an independent lab using ISO 7779 standard ATX12V 2.01 compliant. 24-pin main power connector with detachable 4-pin section for universal motherboard compatibility 4 Serial ATA connectors