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Grey ATX power supply unit with single fan

Replace Power

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

SKU CH-9VD2-8TQSJ MPN AP-MPS3ATX30-3

A 300W ATX power supply with 20+4-pin motherboard, 4-pin CPU, three SATA, three peripheral, floppy, 6-pin PCIe, Dell P6, HP video and AUX connectors

  • ColorGrey
  • TypeATX
  • Fans1
  • Weight0.1
  • 300W output powers standard desktop builds
  • Single 12cm fan cools the unit quietly
  • 20+4 pin ATX connector fits most modern motherboards
  • Three SATA power connectors support multiple drives
  • Six specialised connectors cover Dell, HP and legacy gear

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.

Points forts

  • 300W output powers standard desktop builds
  • Single 12cm fan cools the unit quietly
  • 20+4 pin ATX connector fits most modern motherboards
  • Three SATA power connectors support multiple drives
  • Six specialised connectors cover Dell, HP and legacy gear

Caractéristiques

BrandReplace Power
ModelAP-MPS3ATX30-3
ColorGrey
TypeATX
Fans1
Weight0.1

Questions sur cet article

How do I install the 20+4-pin ATX connector, and what step do people get wrong?

Align the 20+4-pin ATX connector with the motherboard socket, press firmly until the latch clicks, and ensure the 4-pin ATX12V connector is also seated; the common error is leaving the 4-pin CPU power unplugged.

What maintenance or replacement will this unit need later?

The single internal fan is the only moving part; plan to clean dust from its intake every 6–12 months and replace the fan if bearing noise appears, as the supply itself has no user-serviceable components.

What limit shows up first under sustained 300 W load?

Continuous operation at the rated 300 W will hit the thermal limit of the single fan cooling first, causing the protection circuit to shut the unit down before any electrical rating is exceeded.

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