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Compact 1U 250W ATX power supply, matte black metal casing, rear fan grille and modular cable sockets visible

KHACHIMO

KHACHIMO EFA-250 250W 80 PLUS Gold power supply

SKU CH-MT3G-X7C3H

A 250 W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby compatibility for silent low-load operation

  • Product typeATX
  • Modern Standby compatible for fast wake-from-sleep and better low-load efficiency
  • 80 PLUS Gold certified for high efficiency, lower consumption, less noise and cooler operation
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent operation
  • Resonant LLC topology with DC-to-DC conversion delivers clean, consistent power and reduces coil whine
  • DC-to-DC conversion enables more energy-efficient sleep states

1U 250W ATX Power Supply

The KHACHIMO EFA-250 is a compact 1U ATX power supply rated at 250W. It targets small-form-factor builds, embedded appliances and replacement units where space is at a premium. The unit carries 80 PLUS Gold certification and supports Modern Standby for rapid wake-from-sleep.

Sustained-Load Behaviour

At low and medium loads the Zero RPM fan mode stops the cooling fan completely, eliminating audible noise. Under sustained higher loads the fan engages while the resonant LLC topology with DC-to-DC conversion maintains clean, consistent power delivery and suppresses coil whine. Efficiency remains high across the operating range, keeping temperatures and power draw in check.

80 PLUS Gold Practical Limits

The 80 PLUS Gold rating guarantees high efficiency at typical loads, reducing waste heat and electricity cost. It does not define maximum continuous output at elevated ambient temperatures, hold-up time or transient response limits. Designers must verify those parameters against the system's actual power profile before committing to this 250W unit.

How it compares

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

Price $365.99
Pricier than about 83% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

How loud is the 250W unit when it runs continuously?

The Zero RPM fan mode stops the fan completely at low and medium loads, giving near-silent operation; the 80 PLUS Gold efficiency also keeps heat and noise down during all-day use.

What cables or connectors must I already have for this ATX power supply to work?

You need standard ATX motherboard and CPU power cables plus any peripheral connectors your components require; the unit follows the ATX form factor so existing ATX cables will fit.

Will this 250W supply run stably with older components I plan to keep?

The resonant LLC topology with DC-to-DC conversion delivers clean, consistent power and supports modern sleep states, helping it work reliably alongside legacy hardware.

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