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Compact silver ATX power supply unit with fan grille

KHACHIMO

KHACHIMO NFN40-7638EP 40W ATX power supply 80 PLUS Gold

SKU CH-RA1V-JBSK5

A compact 40W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode for silent low-load operation, and Modern Standby support for instant wake times

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops at low loads for silent running
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 40 W ATX unit fits compact builds

Compact 40 W ATX supply for low-power builds

The KHACHIMO NFN40-7638EP delivers 40 W of continuous power in a standard ATX form factor, making it suitable for thin clients, embedded systems or compact office PCs that prioritise efficiency over high output. Its 80 PLUS Gold certification confirms high conversion efficiency across typical load ranges. Modern Standby compatibility enables rapid wake-from-sleep transitions for responsive everyday use.

Fan-less operation at low and medium loads

A Zero RPM fan mode stops the cooling fan entirely while the unit runs at low and medium loads, providing near-silent operation for noise-sensitive environments. The 80 PLUS Gold rating reduces waste heat, which helps keep internal temperatures lower and contributes to quieter overall system acoustics. Resonant LLC topology with DC-to-DC conversion minimises coil whine and supports efficient low-power sleep states.

Stable output during sustained workloads

Resonant LLC topology with DC-to-DC conversion maintains clean, consistent voltage regulation when the supply operates under continuous load rather than short bursts. The design reduces coil whine and enables the use of deeper energy-efficient sleep states during prolonged sessions. High efficiency across the load curve limits heat build-up, supporting reliable performance over extended periods.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops at low loads for silent running
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 40 W ATX unit fits compact builds

Specifications

TypeATX

Questions about this item

How do I install the KHACHIMO NFN40-7638EP 40W ATX power supply and which connection is often missed?

Secure the ATX unit in the case with four screws, attach the 24-pin motherboard connector and the 4/8-pin CPU power connector; the step most builders forget is plugging in the CPU power lead near the socket.

What maintenance will the NFN40-7638EP need over time?

The Zero RPM fan mode keeps the fan off at low and medium loads, reducing wear; periodically clean dust from the intake grill to maintain airflow when the fan does spin.

What limit appears first on the NFN40-7638EP during sustained heavy use?

The 40W total output ceiling is reached before thermal or efficiency limits, so continuous draws above that rating will trigger protection shutdown.

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