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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

  • Product 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.

How it compares

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

Price $230.99
Pricier than about 69% of the 10,869 comparable items (median $142.99).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Product 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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