Cooler Master Real Power 450. Nominal power: 450 W. Noise level: 20 dB. Mean time between failures (MTBF): 400000 h. Safety: Nemko / TUV / cUL / CE / CNS. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): 5 - 50 °C, Operating relative humidity range: 0 - 90 %