StarTech.com 400W ATX12V 2.2 Power Supply. Nominal power: 400 W, AC input frequency: 50 - 60 Hz, Efficiency: 70 %. Width: 150 mm, Height: 86 mm, Weight: 1520 g. Mean time between failures (MTBF): 100000 h. Operating temperature range (T-T): 10 - 50 °C. Package weight: 1880 g