Replace Power Supply Upgrade 400W for Dell Studio Slim 540s 537s 560s SFF Compatibility Dell Studio Slim 540s 537s 560s SFF Output Wattage 400 W 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 400W 20+4 Pin PC Power Supply will easily replace your old, broken, or lagging power supply. With this 400W power supply for Dell Studio Slim 540s 537s 560s SFF TFX power supply, you can replace the PSU in a wide range of Dell desktops. 400W power! With 400W of steady computer power, this TFX Replacement 400W power supply can power both older PCs and new custom builds with a wide range of peripherals.