be quiet! Dark Power. Nominal power: 550 W, Peak power: 650 W, AC input voltage: 100 - 240 V. Fan diameter: 120 mm, Fan location: side, Fan speed: 1010 RPM. Motherboard power connector: 20+4 pin ATX, Connector(s): IEC C14. Noise level: 15.2 dB. Weight: 2.26 kg