Be quiet 450w 80 plus bronze system power 7 power supply bn143 the best possible combination of power quietness features and efficiency this system gives the si a big advantage with worry free compatibility maximum 12v power and rock solid voltages it is 80plus bronze certified and lets you build cost effective systems with superior performance a key differentiator in these days of carbon copy low price psus power connectors 1 x 20 4 pin connector sata connectors 4 x sata c