Power supply unit power 400 watt max power 450 watt certificates 80 plus silver noise emission 154 db pci express connectors 8 pin 2 serial ata connections 5 cable management semi modular mains voltage 100 240 volt mains frequency 50 60 hz efficiency 20 89 efficiency 50 91 efficiency 100 89 cooling system active max fans 1 fan diameter 120 mm rpms 1 060 rpm power factor correction active special features energy star 60