COOLMAX CX-450B 450W ATX Power Supply Fans: 1 x 120mm silent fan design, long life, noiseless and fastest cooling time Main Connector: 20+4Pin +12V Rails: Single Power Good Signal: 100-500ms Efficiency: > = 65% Over Voltage Protection: Yes Input Voltage: 115 / 230 V Input Frequency Range: 50/60 Hz