Bequiet silent wings dark power pro 11 650w power supply it is a fact of the modern world that high technology requires constant refinement and unending improvement acirceurordquo and that is even truer for those who would be leaders dark power pro power supplies are renowned as the worldacirceurotrades quietest and most efficient high performance psus the dark power pro 11 650w model takes that a step further with a power conversion topology that delivers 80plusacircreg pla