Replace Power AP-MPS3ATX30-3 300W ATX power supply

Replacement ATX Power Supply for Deer DR-A300ATX

This 300W ATX unit replaces the original power module in Deer DR-A300ATX systems and compatible desktops from brands such as Dell and HP. It delivers standard ATX power through a 20+4-pin motherboard connector and a 4-pin ATX12V connector. The grey chassis houses a single fan for airflow. It suits builders restoring or repairing older office or home PCs.

Thermals noise and power draw

The supply operates at 300W total output with one internal fan moving air across the power module. Under typical office loads the fan runs at a low speed, keeping noise to a background hum. Power draw from the wall scales with component demand, staying within the 300W rating. No additional cooling hardware is required for normal use.

Connectors and compatibility

Included cables provide one 20+4-pin ATX, one 4-pin ATX12V, one 4-pin HP video, one 6-pin Dell P6, one 6-pin PCI-Express, one 6-pin AUX, three peripheral, three SATA and one floppy connector. This assortment covers the proprietary and standard power inputs found in many Deer, Dell and HP chassis. The variety lets the unit serve as a direct drop-in replacement without adapter cables.