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Grey ATX power supply unit with single fan and standard connectors

Replace Power

Replace Power AP-MPS3ATX30-29 300W ATX power supply

SKU CH-3WDE-XKR1Y MPN AP-MPS3ATX30-29

A 300 W ATX power supply with one fan, 20+4-pin ATX, 4-pin ATX12V, three SATA, two peripheral and one floppy connector

  • Fan configuration1
  • Product colorGrey
  • Product typeATX
  • Product weight0.1
  • 300W steady power for reliable system operation
  • High efficiency design reduces energy waste and heat
  • Low ripple and noise output protects sensitive components
  • Over-voltage protection safeguards hardware from power spikes
  • Multiple connectors including SATA support diverse drive configurations

Direct Replacement PSU

The Replace Power AP-MPS3ATX30-29 is a 300W ATX unit built as a direct replacement for the HP Pavilion a6400f and a1257c. It fits standard ATX bays and supplies the connectors those chassis expect. The grey enclosure keeps the look consistent with office-style builds.

Thermals and Protection

A single fan moves air through the unit while high-efficiency operation limits waste heat. Output over-voltage protection guards connected components if the line fluctuates. Low ripple and noise on the rails keep power delivery clean for the motherboard and drives.

Connectors for Legacy Builds

The loom includes one 20+4-pin ATX connector, one 4-pin ATX12V connector, three SATA power connectors, two peripheral connectors and one floppy drive connector. This mix supports older motherboards, parallel ATA drives and floppy devices in a single harness. No modular cables mean the full set is always present.

How it compares

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

Price $62.99
Cheaper than about 83% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power
Model nameAP-MPS3ATX30-29
Product colorGrey
Product typeATX
More details
Fan configuration1

Questions about this item

How do I install the 20+4-pin ATX and 4-pin ATX12V connectors, and what is the step people often get wrong?

Align the keyed 20+4-pin ATX and 4-pin ATX12V plugs with the motherboard sockets and press until they click; the common mistake is leaving the 4-pin ATX12V loose, which prevents the system from posting.

What maintenance will this 300W unit need over time?

Clean the single fan intake with compressed air every few months to prevent dust build-up; the internal capacitors are not user-serviceable, so replacement means swapping the whole supply.

Which limit appears first when the supply runs near 300W for long periods?

The 300W total-output ceiling is reached before any single rail limit, so sustained loads above that rating will trigger over-voltage protection and shut the unit down.

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