Power supply unit power 550 watt certificates 80 plus gold noise emission 211 db pci express connectors 8 pin 2 serial ata connections 6 cable management fully modular mains voltage 100 240 volt mains frequency 47 63 hz efficiency 100 92 max fans 1 fan diameter 135 mm rpms 924 rpm power factor correction active mtbf 100 000 hours motherboard power connectors atx12v 204 pins current strengths 3 3v 25 a 5v 25 a 5vsb 3 a 12