Give your computer an upgrade or a reliable replacement component with the Thermaltake TR2-500NL2NC ATX12V and EPS12V 500W Power Supply. It operates at 72 percent efficiency, conserving energy while you run your machine. The Thermaltake power supply is also suitable for a custom build. It runs quiet and is easy to install. It comes with a fan, connectors, cables and a rocker on/off switch.