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

KHACHIMO

KHACHIMO S11-400P1A 400W ATX power supply

SKU CH-THHP-D1A7H

An 80 PLUS Gold ATX unit with zero-RPM fan mode, Modern Standby support and LLC resonant topology for quiet, efficient 400W delivery

  • TypeATX
  • Modern Standby support for near-instant wake from sleep
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode keeps the unit silent at low load
  • Resonant LLC topology with DC-to-DC conversion delivers clean, stable power
  • 400 W ATX output handles mainstream system builds

1U ATX supply for Modern Standby PCs

This KHACHIMO S11-400P1A delivers 400 W from a 1U frame that fits rack or slimline chassis. The unit carries 80 PLUS Gold certification and uses resonant LLC topology with DC-to-DC conversion for tight voltage regulation. Modern Standby support keeps wake times short and idle draw low.

Suits compact workstations and quiet home labs

Builders needing more than 400 W for multi-GPU rigs or heavy overclocking should look elsewhere. The 1U height also rules out standard ATX towers that expect full-height units. No modular cables are mentioned, so cable-routing flexibility is limited.

400 W 80 PLUS Gold in a 1U form factor

That single figure tells you whether the rail capacity matches your CPU and GPU combined draw. If the total design power stays under 400 W the supply will run efficiently and silently thanks to its zero-RPM fan mode.

Highlights

  • Modern Standby support for near-instant wake from sleep
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode keeps the unit silent at low load
  • Resonant LLC topology with DC-to-DC conversion delivers clean, stable power
  • 400 W ATX output handles mainstream system builds

Specifications

TypeATX

Questions about this item

Will the 400W unit power an older ATX motherboard that still uses a 24-pin main connector and 4-pin CPU plug?

Yes, the ATX form factor provides the standard 24-pin and 4-pin connections used by legacy boards, and the 400W rating covers typical older platforms.

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

Under light loads the fan stops completely; you can verify silence visually and audibly while the system idles or runs basic tasks.

Which cables are permanently attached to the S11-400P1A and what must I source separately?

The unit comes with its fixed ATX cable set; any specialised GPU adapters or custom sleeved kits are not included and must be purchased separately.

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