The Dell OptiPlex 390 790 990 D250AD-00, HU250AD-00 Power Supply 250W 0HY6D2 is a reliable and efficient power supply unit designed for Dell computers. It has a maximum power output of 250W, suitable for powering various components such as the motherboard, CPU, graphics card, and SATA devices. The power supply features a 24 pin, 4 pin 12V, and SATA connectors for seamless connectivity. With a sleek silver color and ATX form factor, this Dell power supply is a compatible and tested option for your computing needs.