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Silver 1U ATX power supply unit with rear fan grille and cable bundle

KHACHIMO

KHACHIMO 1U 400W ATX Power Supply NPS-400CB A

SKU CH-RH4G-JS1NF

A 1U 400 W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and resonant LLC topology for clean, quiet power

  • TypeATX
  • Faster wake from sleep with Modern Standby support
  • Lower energy draw thanks to 80 PLUS Gold efficiency
  • Near-silent running at light loads via Zero RPM fan mode
  • Clean, stable power delivery from resonant LLC with DC-to-DC conversion
  • Compact 1U form factor fits space-constrained builds

1U 400W ATX power supply

This KHACHIMO 1U unit delivers 400 W of ATX power in a rack-mount height. It targets system builders assembling compact servers or workstations that require Gold-class efficiency. The modern standby support enables rapid wake-from-sleep for always-on deployments. It is not suited for builds needing more than 400 W or redundant power modules.

Standard ATX connectors in a 1U chassis

Installation follows normal ATX cabling inside a 1U enclosure, so cable routing space is tight. The short depth helps fit shallow racks, yet the fixed cables limit custom sleeving. Zero RPM fan mode activates at low and medium loads, removing acoustic concerns during idle periods. Builders without 1U rail clearance will find the form factor incompatible.

Gold efficiency under continuous load

80 PLUS Gold certification means the supply maintains high efficiency across sustained workloads, reducing heat and operating cost. Resonant LLC topology with DC-to-DC conversion keeps voltage regulation tight during prolonged demand. The fan remains off until thermal thresholds rise, then spins up to maintain safe temperatures. Extended full-load runs stay within spec without throttle or shutdown.

Highlights

  • Faster wake from sleep with Modern Standby support
  • Lower energy draw thanks to 80 PLUS Gold efficiency
  • Near-silent running at light loads via Zero RPM fan mode
  • Clean, stable power delivery from resonant LLC with DC-to-DC conversion
  • Compact 1U form factor fits space-constrained builds

Specifications

TypeATX

Questions about this item

How can I verify the 80 PLUS Gold efficiency is active after installing this 400W supply?

Check the 80 PLUS Gold badge on the unit and monitor power draw under load; the certification means the supply meets the efficiency targets at typical loads.

What cables and accessories come with the NPS-400CB A and what must I source separately?

The box includes the 1U 400W ATX power supply; mounting screws and any specialised cables for your chassis are not included and must be purchased separately.

Which NPS-400CB variant — A, B or C — should I select for a standard ATX build?

Choose the NPS-400CB A; it is the ATX-type model listed for this product, while the B and C versions correspond to different form factors or connector layouts.

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