Arctic Cooling Fusion 550R. Nominal power: 550 W, AC input frequency: 50 Hz, Input current: 3 A. Form factor: ATX, Colour of product: Black. Fan diameter: 80 mm. Certification: CUL (Level 6) / CE / CB. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -40 - 80 °C, Operating relative humidity range: 20 - 80 %