Limit 1 per customer. The Silverstone SX500-LG is a 500W SFX power supply that includes all the features available from the top of the line SFX SilverStone PSUs such as 80 PLUS Gold efficiency, modular flexible flat cables, and semi-fanless capability. An ATX adapter bracket is included as well to enable users to install this PSU into any small or even larger cases that do not have SFX mounting holes.