Use this Replacement Power Supply to upgrade your old Dell Liteon PS-5251-5 Compatibility: Dell Liteon PS-5251-5 Connectors: 20+4 Pin Motherboard, 4-Pin CPU, 2x Molex, Floppy, 2x SATA Cooling: 80mm Cooling Fan w/ Double Ball Bearing Weight: 3 lb Input Voltage: 100/240 V This TFX 350w 20+4 Pin PC Power Supply will easily replace your old, broken, or lagging power supply. With this 350w power supply, you can replace the PSU in a wide range of Dell desktops. 350w power! With 350w of steady computer power, this TFX Replacement 350w power supply can power both older PCs and new custom builds with a wide range of peripherals.