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Grey ATX power supply unit with single fan

Replace Power

Replace Power AP-MPS3ATX30-28 power supply 300W ATX

SKU CH-SJKP-E9H6W MPN AP-MPS3ATX30-28

300 W ATX power supply with 20+4-pin, 4-pin CPU, three SATA and two peripheral connectors for Gateway GT5428 and GM5424 systems

  • Fan configuration1
  • Product colorGrey
  • Product typeATX
  • Product weight0.1
  • 300W steady power for reliable system operation
  • High efficiency design reduces energy waste
  • Low ripple and noise protects sensitive components
  • Over voltage protection safeguards connected hardware
  • Multiple connectors including SATA power for drives

Replacement 300 W ATX unit

This Replace Power supply delivers 300 W of continuous output in a standard ATX form factor. It is built as a direct swap for the Gateway G Series GT5428 and GM5424 desktops. The unit also fits other compatible Dell, HP or similar systems that require a 300 W ATX power source.

Connector layout and fit

Installation uses the native 20+4 pin ATX motherboard connector and a single 4 pin ATX12V CPU plug. Two peripheral connectors, one floppy drive connector and three SATA power leads cover legacy and current drives. The grey chassis houses one fan; verify that your case accepts a standard ATX depth before fitting.

Capacity and limits

The 300 W rating suits basic office builds, legacy upgrades or low-power graphics cards. It will not sustain modern mid-range GPUs or multi-drive arrays under heavy load. Over-voltage protection guards connected components, yet headroom disappears quickly when peak draw approaches the rated maximum.

How it compares

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

Price $64.99
Cheaper than about 82% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power
Model nameAP-MPS3ATX30-28
Product colorGrey
Product typeATX
More details
Fan configuration1

Questions about this item

How can I confirm the 300W unit is delivering stable power to my Gateway GT5428 after installation?

The system should boot reliably, show no unexpected shutdowns under load, and the single fan should spin quietly while the over-voltage protection keeps ripple and noise low.

Which cables are included with the AP-MPS3ATX30-28 and what must I source separately?

The box contains one 20+4-pin ATX connector, one 4-pin ATX12V connector, two peripheral connectors, one floppy connector and three SATA power connectors; any additional adapters or extension cables are not included.

Should I choose the 300W grey ATX model or a different capacity for my GM5424?

The 300W grey ATX unit is the specified replacement for both the Gateway GT5428 and GM5424; no other capacity or colour variant is listed for these models.

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