The Sonata Plus 550 features the NeoPower 550 modular power supply unit (PSU) giving it the most juice in a Sonata case. You wont hear it though because sound-deadening panels and a user-selectable, 3-speed 120mm case fan provide optimum cooling and whisper-quiet operation. With High Definition front audio ports it's crystal clear when it comes to producing the sound you want to hear. In today's age of multimedia, data requirements have swelled. That is why the Sonata Plus 550 comes with USB 2.0 and IEEE 1394 (FireWire , iLink) connectors on the front of the case for convenient data transfer. The NeoPower PSU is equipped with universal input and Active PFC so it will work anywhere in the world. The Sonata Plus 550 is the perfect combination of style, silence and efficiency.