Enermax ECO80+ 400W CrossFire X. Nominal power: 400 W, AC input voltage: 100 - 240 V, AC input frequency: 50/60 Hz. Mean time between failures (MTBF): 1000000 h. Certification: 80+. Operating temperature range (T-T): 7 - 40 °C, Operating temperature range (T-T): 18.2 - 104 °F