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Rectangular ATX power supply unit with metal casing and single 120mm cooling fan visible

E-POWER

E-POWER EP-400PM power supply 400W ATX12V 2.0 120mm fan 2 SATA

SKU CH-YBJQ-5WKGB MPN EP-400PM

A 400 W ATX12V 2.0 unit with a 120 mm fan, dual 12 V rails and two SATA connectors

  • Max wattage400 W
  • Power efficiency75% Efficiency Rating
  • Modular cablingNon-Modular
  • Fan configurationSingle 120 mm Cooling Fan
  • Main power connector20+4Pin
  • 12V rails2

Model ATX (400W)

  • 400 W maximum output powers standard desktop builds
  • 75 % efficiency rating reduces wasted energy
  • 120 mm cooling fan keeps temperatures low
  • Dual +12 V rails deliver stable voltage to components
  • Two SATA connectors support modern storage drives

400 W ATX12V 2.0 PSU

This unit delivers a maximum output of 400 W through an ATX12V 2.0 design. It targets builders assembling basic office or home PCs that need a fixed cable set. The non-modular layout keeps wiring simple for first-time system integrators. It fits standard ATX cases with a maximum length of 140 mm.

Thermals noise and power draw

A single 120 mm cooling fan handles airflow across the internal components. The supply operates at a 75 % efficiency rating under typical loads. It accepts input voltages of 115 or 230 V across a 50/60 Hz range. Dual +12 V rails provide 14 A and 15 A respectively for balanced distribution.

Bundled connectors and their impact

The fixed harness includes one 20+4 pin ATX connector, one 4 pin ATX connector, two SATA power plugs, four Molex plugs and one FDD connector. These cables support a motherboard, two SATA drives and multiple legacy peripherals without adapters. Builders needing more SATA devices or modular cable management must look elsewhere.

How it compares

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

Price $31.99
Cheaper than about 94% of the 10,869 comparable items (median $142.99).
Max wattage 400 W
Lower than about 88% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameePOWER
Product linePM Series
Model nameEP-400PM
Product typeATX12 V 2.0
Ports & slots
SATA power connectors2
Output type+3.3 V@22A, +5 V@30A, +12V1@14A, +12V2@15A
Connection types1 x ATX 24pin & 20 pin
1 x ATX 4 pin
2 x SATA
4 x Molex 4 pin
1 x FDD
Power
Max wattage400 W
Power efficiency75% Efficiency Rating
Modular cablingNon-Modular
Main power connector20+4Pin
12V rails2
Supply voltage115 / 230 V
AC input frequency50/60 Hz
Rated input current10–6A
Size & build
Product dimensions3.38 in × 5.51 in × 5.91 in
Product weight4 lb (1.81 kg)
Shipping weight1.18 kg
Package size254 × 203 × 102 mm
Compatibility
PSU length limit140 mm
More details
Fan configurationSingle 120 mm Cooling Fan

Other versions of this model

1 more in the same range

Questions about this item

How do I install the EP-400PM in my case and what step often goes wrong?

Mount the 140 mm long unit with four screws, connect the 20+4 pin main and 4 pin CPU cables, then plug the two SATA and four Molex leads; the common mistake is leaving the 4 pin CPU connector loose.

What maintenance or replacement will the EP-400PM need later?

The single 120 mm fan is the only moving part; clean dust from its grille every few months and replace the whole supply if the fan becomes noisy or airflow drops.

Which limit appears first when the EP-400PM runs under sustained load?

The +12V rails are rated at 14 A and 15 A each; drawing more than those currents on either rail triggers the protection circuit before the 400 W total is reached.

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