Replacement Power Supply for Bestec TFX0250D5W used in the Dell Inspiron 530s 531s Slimline SFF This power supply has 420 watts of power and can be a replacement for the 250 watt / 300 watt / 320 watt versions. Compatibility: TFX0250D5W / Dell Inspiron 530s 531s Output Wattage: 420 w Connectors: 20+4 Pin Motherboard, 4-Pin CPU, 2x Molex, Floppy, 2x SATA Cooling: 80mm Cooling Fan w/ Double Ball Bearing Input Voltage: 100/240 V This TFX 420w 20+4 Pin PC Power Supply will easily replace your old, broken, or lagging power supply. With this 420w power supply replacement for TFX0250D5W / Dell Inspiron 530s 531s. You can replace the PSU in a wide range of PC desktops. With 420w of steady computer power, this TFX Replacement 420w power supply can power both older PCs and new custom builds with a wide range of peripherals. Easy cooling systems! With a passive 80mm cooling fan, this 420w TFX Replacement PSU will never overheat or burn out your system!