Dark power pro 11 550w is be quietrsquos most advanced psu ever delivering 80plusreg platinum efficiency effortless quad gpu support and unmatched silence the improved features include 80plusreg platinum power efficiency and unmatched power stability up to 94 thanks to half bridge llc sr and dcdc technology virtually inaudible silentwingsreg 3 135mm fan with fluid dynamic bearing 6 pole fan motor and ic motor control for smooth low speed operation and reduced noise large funne