Rosewill CAPSTONE Series 550W 80 Plus Gold Certified ATX12V/EPS12V Power Supply CAPSTONE-550 ATX12V v2.31 / EPS12V v2.92 80 PLUS Gold Certified Efficiency up to 92% 1 x Silent 140mm Fan Main Connector: 20+4Pin Intel Haswell CPU Ready Single strong 12V rail - idea for Gaming system SLI & Crossfire Ready - 2 x 6+2pin Connector