This seasonic industrial power supply is 80 plus efficiency rated and it features a high reliability ball bearing fan. fully modular cables and easy-swap connectors add a new dimension to its versatility, while the seasonic smart and silent fan control (s2fc) system make it a silent performer. these units comply with the latest pfc harmonics (iec1000-3-2 and en61000-3-2 standards) and are protected against short circuit, over voltage and over power. on the 3.3 v rail there is no minimum load requirement for this unit to work properly.