Antec PHANTOM 500 12V 2.0 500W ATX Power Supply ATX12V version 2.01 compliant with 24-and-20-pin adapter connector with detachable 4-pin section for 20-pin for backward compatibility with older motherboards Dual +12V outputs, with dedicated circuits to isolate the CPU power line from peripherals. Hybrid fan design Exceptional power efficiency up to 86% (US version) at full load 4 Serial ATA power connectors