KENTEK 550 Watt 550W Silver 12cm 120mm Fan ATX Power Supply 12V SATA 20/24 PIN PCI EXPRESS PCI-E Intel AMD by KENTEK 550 watt atx power supply perfect for upgrade and replacement 120mm large fan Quiet Performance and High energy efficiency Ball bearing fan with matel gurad grill, Sleeve on main connector Short circuit, over/under voltage surge, over current, under load and over power protection I/O ON/OFF switch for manual control