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Compact 1U silver ATX power supply unit with rear fan grille

KHACHIMO

KHACHIMO EFA-300 300W ATX Power Supply

SKU CH-TNCX-RQ718

A 300W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for quiet, low-power operation

  • Product typeATX
  • Modern Standby support delivers extremely fast wake-from-sleep and better low-load efficiency
  • 80 PLUS Gold certification ensures high efficiency for lower power consumption, less noise, and cooler temperatures
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent operation
  • Resonant LLC topology with DC-to-DC conversion provides clean, consistent power and reduces coil whine
  • 300W ATX power supply compatible with modern sleep states and efficient low-load operation

300W ATX Power Supply

The KHACHIMO EFA-300 is a 300W ATX power supply built for compact systems that require efficient, low-noise power delivery. It carries 80 PLUS Gold certification and supports Modern Standby for rapid wake times and improved low-load efficiency.

Best for silent compact builds.

This unit suits small-form-factor PCs, office workstations and home-theatre systems where quiet operation and standby efficiency matter. Zero RPM fan mode keeps acoustics near zero at light loads. Builders needing more than 300W for discrete graphics cards, multi-drive arrays or overclocked CPUs should select a higher-capacity model.

80 PLUS Gold efficiency

Gold-rated efficiency reduces waste heat and running costs while helping the fan stay off longer. The resonant LLC topology with DC-to-DC conversion delivers stable voltages and minimises coil whine, supporting deeper sleep states for Modern Standby compliance.

How it compares

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

Price $495.99
Pricier than about 90% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

Will this ATX power supply work with a motherboard that relies on Modern Standby sleep states?

Yes, it is Modern Standby Compatible and the resonant LLC topology with DC-to-DC conversion enables use of more energy efficient sleep states.

How can I confirm the 80 PLUS Gold efficiency is active after installation?

The unit runs cooler and quieter at typical loads, and the Zero RPM Fan Mode keeps the fan off entirely at low and medium loads, which is a direct result of high efficiency operation.

Are the ATX and CPU power cables attached to the unit or must they be purchased separately?

The cables are fixed to the unit, so the 24-pin ATX and 4+4-pin CPU connectors are included and no separate cables are required for a standard build.

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