Rosewill Stallion Series - 500-Watt ATX12V v2.2 Power Supply - RD500-2SB Fans: Single 12cm Ball Bearing Fan Main Connector: 20+4Pin +12V Rails: 2 PCI-Express Connector: 2 x 6-Pin SATA Power Connector: 4 Over Voltage Protection: Yes Input Voltage: 115 / 230 V Input Frequency Range: 50/60 Hz