Replace Power Supply PSU TFX Upgrade Slimline SFF for Dell Inspiron 537s 540s 545s Compatibility: Dell Inspiron 537s, Dell Inspiron 540s, Dell Inspiron 545s Connectors 20+4 Pin Motherboard, 4-Pin CPU, 3x Molex, Floppy, 3x SATA Cooling 80mm Cooling Fan w/ Double Ball Bearing Input Voltage 100/240 V Replace Power Supply PSU TFX Upgrade Slimline SFF for Dell Inspiron 537s 540s 545s This TFX 420W 20+4 Pin PC Power Supply will easily replace your old, broken, or lagging power supply. With this 420W TFX replacement power supply, you can replace the PSU in a wide range of Dell desktops.