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Rectangular ATX power supply unit with matte black finish and cooling fan visible

KHACHIMO

KHACHIMO Power Supply 400W BES-540C

SKU CH-P9SJ-QSQTP

An ATX power supply delivering 400 W with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support

  • TypeATX
  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops at low load for silent running
  • Resonant LLC plus DC-to-DC gives clean, stable power
  • ATX form factor fits standard desktop builds

400W ATX power supply for BES-540C

This KHACHIMO unit delivers 400W of continuous power in a standard ATX form factor. It is designed specifically for the BES-540C platform and carries 80 PLUS Gold certification for high efficiency. Modern Standby compatibility enables extremely fast wake-from-sleep times and improved low-load efficiency. Resonant LLC topology with DC-to-DC conversion provides clean, consistent power delivery.

Builders needing Gold efficiency

Suitable for system integrators and upgraders who require a replacement or spare unit matched to the BES-540C chassis. The Zero RPM fan mode stops the fan entirely at low and medium loads for near-silent running. Buyers who need higher wattage output or a different form factor for another chassis should look at other models. This unit is not intended for platforms outside the specified BES-540C application.

Standard ATX installation with semi-passive cooling

Installation follows normal ATX mounting and cabling procedures inside a compatible chassis. The Zero RPM mode engages automatically, so no software configuration is required for silent operation at idle. Ensure the BES-540C connector layout matches your motherboard before fitting. Coil whine is reduced by the resonant LLC design, but audible noise can still appear under sudden load transients.

Points forts

  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops at low load for silent running
  • Resonant LLC plus DC-to-DC gives clean, stable power
  • ATX form factor fits standard desktop builds

Caractéristiques

TypeATX

Questions sur cet article

What motherboard power connector does the 400W unit require?

The supply uses a standard ATX connector, so any motherboard with a 24-pin ATX socket will power on.

Can the Gold-rated supply run efficiently with legacy components that draw very little power at idle?

Yes, Modern Standby compatibility and the LLC resonant topology keep efficiency high even at low loads typical of older hardware.

How do I confirm the fan’s Zero RPM mode is active after assembly?

With the system idle, listen for the fan; it should stay completely still until the load rises above the internal threshold.

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