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Rectangular black ATX power supply unit with cooling fan and cable bundle

KHACHIMO

KHACHIMO R300 400W ATX Power Supply DPS-400YB-1 A D400P-01 CX357

SKU CH-6AJK-5NQ3M

A 400 W ATX power supply with 80 PLUS Gold efficiency, Modern Standby support, Zero RPM fan mode and resonant LLC DC-to-DC topology for clean, quiet power delivery

  • Product typeATX
  • Faster wake-from-sleep with Modern Standby compatibility
  • Lower electricity draw thanks to 80 PLUS Gold efficiency
  • Silent running at light loads via Zero RPM fan mode
  • Clean, stable power delivery from resonant LLC topology with DC-to-DC conversion
  • Reduced coil whine and cooler operation through advanced topology

400W ATX Power Supply

The KHACHIMO R300 400W ATX unit delivers 80 PLUS Gold certified efficiency for desktop builds that prioritise low power draw and quiet running. Modern Standby compatibility ensures extremely fast wake-from-sleep times and improved low-load efficiency. Resonant LLC topology with DC-to-DC conversion provides clean, consistent power while reducing coil whine. It suits mainstream systems where a 400W ceiling matches the component list.

Sustained-load behaviour

At low and medium loads the Zero RPM fan mode stops the cooling fan entirely for near-silent operation. The 80 PLUS Gold rating maintains high efficiency across the load curve, lowering power consumption and keeping temperatures cooler during extended sessions. Resonant LLC topology with DC-to-DC conversion supports stable voltage regulation under continuous demand. The design enables more energy-efficient sleep states without sacrificing output quality.

Upgrade context

This unit replaces older, lower-efficiency power supplies that lack Modern Standby support or zero-fan capability. The jump is worthwhile when a build needs Gold-level efficiency, quieter low-load acoustics, and faster wake times without exceeding a 400W power budget. Systems requiring higher wattage or additional connectivity beyond this specification should look elsewhere.

How it compares

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

Price $106.99
Cheaper than about 64% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

How loud does the KHACHIMO R300 400W get under continuous load?

The Zero RPM Fan Mode keeps the fan off at low and medium loads for silent running, while the LLC resonant topology with DC-to-DC conversion reduces coil whine so the unit stays quiet even when delivering full power.

What existing cables or connectors must my build already provide for this PSU to function?

It uses the standard ATX form factor, so your case must accept an ATX supply and your motherboard needs the usual 24-pin and CPU power sockets; the unit itself supplies all required output leads.

Will the DPS-400YB-1 A work reliably with older components that draw very little power at idle?

Yes, Modern Standby compatibility and the DC-to-DC design enable efficient low-load operation, so legacy parts that sit at minimal draw are supported without stability issues.

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