Logisys New Power Supply Upgrade for COMPAQ PRESARIO SR1800 Series Desktop Computer - Fits The Following Models: SR1800NX, SR180 Guaranteed tofit your model Compaq Presario listed below in the Product Description 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 480 Watts - This is an upgrade with additional wattage for additional devices, this replaces lower wattage power supplies Special features: On/Power Switch, High Efficiency, Low Noise and Ripple Fan, Energy Star Efficiency, Over Power protection, Short Circuit Protection, Over Voltage protection, Meet UL 1950