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Rectangular silver ATX power supply unit with fan grille

KHACHIMO

KHACHIMO 400W ATX power supply 80 PLUS Gold 12V 31A

SKU CH-7DHJ-EK7CP

An ATX power supply delivering 400 W with 80 PLUS Gold efficiency and a 12 V rail rated at 31 A

  • TypeATX
  • 80 PLUS Gold certified for lower power draw and cooler running
  • Zero RPM fan mode stops the fan at low loads for near-silent operation
  • Modern Standby compatible for extremely fast wake-from-sleep and better low-load efficiency
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • 12 V rail rated at 31 A provides strong single-rail power for components

400W ATX Power Supply for Efficient Builds

This 400 watt ATX unit targets system builders who want 80 PLUS Gold efficiency and Modern Standby compatibility in a standard form factor. It supplies a 12V rail rated at 31A to support mainstream components. The resonant LLC topology with DC-to-DC conversion delivers stable voltage regulation for reliable daily operation. It is not suited for high-end multi-GPU configurations or workstations demanding substantially higher peak output.

Capacity and Headroom on the 12V Rail

The single 12V rail provides 31 amps, which comfortably handles mid-range graphics cards and modern CPUs under typical gaming or productivity loads. Total continuous output is rated at 400 watts, so sustained heavy overclocking or dual-card setups will exceed the available headroom. Peak demand above this level triggers protection circuits to prevent damage. Builders planning future upgrades to power-hungry parts should verify their total system draw against this limit.

Thermals, Noise and Power Draw

80 PLUS Gold certification means the unit runs efficiently, reducing waste heat and overall power draw at typical loads. A Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent operation. The resonant LLC design further minimises coil whine, contributing to a quieter acoustic profile. Under heavier loads the fan engages to maintain safe temperatures while preserving efficiency.

Points forts

  • 80 PLUS Gold certified for lower power draw and cooler running
  • Zero RPM fan mode stops the fan at low loads for near-silent operation
  • Modern Standby compatible for extremely fast wake-from-sleep and better low-load efficiency
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • 12 V rail rated at 31 A provides strong single-rail power for components

Caractéristiques

TypeATX

Questions sur cet article

Will this 400W ATX unit fit and power an older system that uses a standard 24-pin motherboard connector?

Yes, the ATX form factor and 400W rating with a 12V 31A rail are designed for standard desktop motherboards and components.

How can I confirm the Zero RPM fan mode is active after installation?

Under light loads the fan stops completely; you can verify silent operation by listening for no fan noise during idle or low-demand tasks.

What cables come attached to the PSU and what must I source separately?

The supply ships with fixed ATX power cables; any specialised adapters or extensions for non-standard builds are not included.

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