New Slimline Power Supply Upgrade for SFF Desktop Computer - Fits: Dell Studio Slim 540S Guaranteed tofit your model Slimline Computer List below 1 x Main connector (20+4Pin) This works with both 20 pin and 24 pin main connectors! 1 x 12V P4 connector, 3 x 4-pin Molex Connector, 2 x SATA(Serial ATA) connector, 1 x Floppy connector 300 Watts - This is an upgrade with additional wattage for additional devices, this replaces lower wattage power supplies