DELL Dimension C521 slimlin power supply L280P-01 MH596 Genuine Dell 280 Watt Power Supply For Optiplex 210L, 330, 360, 740, 415, 755, GX520, GX620, GX280, and Dimension C521 Desktop Connectors: 1x 24-Pin Standard ATX Power Connector 1x 4-Pin Molex Connector 1x 4-Pin ATX Power Connector; 2x SATA Power Connectors 1x Floppy Power Connector