The Dell Power Supply Model HP-P2507F3C is a reliable power module designed specifically for Dell computers. With a maximum power output of 250W and compatibility with a 100 -127V volt AC supply, this ATX form factor power supply is ideal for the Dell Dimension 4550 model. It features a gray color design with one cooling fan and multiple connectors including DC output for: +5V (22A), +12V (14A), +3.3V (18A), -12V (1A), +5VSB (2.0A). The connectors included are:(1) 20-Pin ATX Main Power,(1) 4-Pin ATX 12V CPU Power,(5) IDE / Molex Connectors, and(1) Floppy Power Connector. This Dell power supply unit is ideal for legacy Dell Computer repairs or rebuilding projects.