Power supply unit power 850 watt certificates 80 plus bronze noise emission 35 db pci express connectors 8 pin 4 serial ata connections 12 cable management semi modular mains voltage 100 240 volt mains frequency 47 63 hz efficiency 20 86 efficiency 50 88 efficiency 100 86 cooling system active max fans 1 fan diameter 140 mm power factor correction active special feature power switch motherboard power connectors atx12v 24 pi