CORSAIR RMx Series RM550X 550W 80 PLUS GOLD Haswell Ready Full Modular ATX12V & EPS12V SLI and Crossfire Ready Power Supply Fans: 1 x 135mm Rifle fan Main Connector: 20+4Pin +12V Rails: Single PCI-Express Connector: 2 x 6+2-Pin SATA Power Connector: 6 Over Voltage Protection: Yes Input Voltage: 100 - 240 V Input Frequency Range: 47 - 63 Hz