Rosewill Stallion Series 500W ATX12V Power Supply - RD500-2DB Fans: Dual 8cm Ball Bearing Fan Main Connector: 20+4Pin +12V Rails: 2 PCI-Express Connector: 2 x 6-Pin SATA Power Connector: 4 Hold-up Time: > 12ms Efficiency: > 65% Over Voltage Protection: +3.3V +5V +12V1 +12V2