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Grey ATX power supply unit with single fan

Replace Power

Replace Power AP-MPS3ATX30-21 300W ATX power supply

SKU CH-H6RY-T2F6E MPN AP-MPS3ATX30-21

A 300W ATX power supply with 20+4-pin, 4-pin, three SATA, two peripheral and one floppy connector for Gateway ET1810-03 and eMachines ET1810-03 systems

  • Fan configuration1
  • Product colorGrey
  • Product typeATX
  • Product weight0.1
  • Reliable 300W output powers compatible desktop systems
  • Low ripple and noise protects sensitive components
  • Over-voltage protection safeguards connected hardware
  • High efficiency design reduces wasted energy
  • Includes 20+4 pin ATX, 4-pin ATX12V, SATA and peripheral connectors

Direct replacement for Gateway ET1810-03

The Replace Power AP-MPS3ATX30-21 is a 300W ATX unit built to replace the original supply in Gateway ET1810-03 and eMachines ET1810-03 desktops. It also fits other compatible Dell, HP or similar systems that use a standard ATX form factor. Grey housing and a single fan keep the profile familiar for quick swaps.

Steady output under continuous load

Rated at 300W, the supply delivers consistent power rather than a short burst peak. High efficiency and low ripple and noise help maintain stable voltages during extended sessions. Output over voltage protection guards connected components if the line spikes.

Connector mix for legacy and current drives

One 20+4-pin ATX connector and one 4-pin ATX12V connector feed the motherboard and CPU. Three SATA power connectors support modern drives, while two peripheral connectors and one floppy connector cover older devices. This spread lets you reuse existing storage and optical hardware without adapters.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $59.99
Cheaper than about 85% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power
Model nameAP-MPS3ATX30-21
Product colorGrey
Product typeATX
More details
Fan configuration1

Questions about this item

How much heat and noise does the 300W unit produce with its single fan during all-day use?

The grey ATX chassis uses one fan to move air through the 300W power module, keeping ripple and noise low while the over-voltage protection circuit guards components during continuous operation.

Which cables from the existing Gateway ET1810-03 must stay in place for this replacement to work?

The motherboard keeps its 20+4-pin ATX and 4-pin ATX12V plugs, while drives retain two peripheral, one floppy and three SATA power connectors supplied by the new unit.

Will the 20+4-pin ATX and 4-pin ATX12V connectors fit the older Dell or HP board I plan to keep?

Both connectors follow the standard ATX pinout used on many legacy Dell and HP desktops, so the 300W replacement slots in without adapter cables.

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