Thermaltake W0101RU ATX Power Supply. Nominal power: 550 W, AC input frequency: 60 Hz, Input current: 10 A. Fan diameter: 1 mm. Connector(s): 20+4-pin Main Connector & 4-pin Power Connector. Certification: Safety / EMI Approvals: UL, CUL, TUV, CE, and CB certification.