We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • ColorGrey
  • TypeATX
  • Fans1
  • 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.

Highlights

  • 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

Specifications

BrandReplace Power
ModelAP-MPS3ATX30-29
ColorGrey
TypeATX
Fans1
Weight0.1

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.