Silverstone Tek 850 Watts 80 Plus Certified Active PFC ATX PS/2 Power Supply (OP850-P) Class-leading single +12V rail with 70A 850W continuous power output rated up to 50 degree C Low ripple & noise with 3% voltage regulation Efficiency greater than 80% at 20%~100% loading Quad PCI-E 6pin, dual PCI-E 8pin connectors Silent running 120mm Fan with 20 Dba Support ATX 12V 2.3 & EPS 12V