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Black ATX power supply unit with fan grille

KHACHIMO

KHACHIMO GPS-400AB B 400W ATX Power Supply

SKU CH-MK3P-78FF0

A 400W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode for silent low-load operation and Modern Standby compatibility for fast wake times

  • Product typeATX
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Modern Standby support enables rapid wake-from-sleep
  • Zero RPM fan mode stops the fan at low loads
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • ATX form factor fits standard desktop cases

400 W ATX Power Supply

This KHACHIMO GPS-400AB B unit delivers 400 W of continuous power in a standard ATX form factor. It is built for office PCs, home workstations and entry-level gaming builds that require reliable, efficient energy conversion. The 80 PLUS Gold certification ensures high efficiency across typical load ranges. Modern Standby compatibility allows extremely fast wake-from-sleep times and improved low-load efficiency.

Upgrading from lower-efficiency or noisy units

Replacing an older Bronze-rated or uncertified PSU with this Gold-certified model reduces power consumption, lowers heat output and cuts fan noise. The resonant LLC topology with DC-to-DC conversion provides cleaner power delivery and reduces coil whine. Zero RPM fan mode keeps the system near-silent at low and medium loads. The jump is worthwhile when building a quiet, modern sleep-capable PC.

Compatibility checks before ordering

Verify that your case accepts a standard ATX power supply and that the cable complement matches your motherboard, CPU and GPU power connectors. Confirm the total system power draw stays within the 400 W rating under full load. Ensure the physical dimensions fit your chassis clearance. This unit is not for builds requiring higher wattage or specialised server form factors.

How it compares

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

Price $140.99
Typical for this category: the median of 10,869 items is $142.99.

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Specifications

Product
Product typeATX

Questions about this item

What clearance does this ATX 400 W unit need inside the case?

It fits a standard ATX mounting pattern and requires the usual rear clearance for the power cord and fan exhaust; allow enough depth for cables to bend without stress.

How do I install the power supply and which step is commonly missed?

Secure the unit with four screws at the back of the case, route the fixed 24-pin motherboard and CPU 4+4-pin cables, then connect every required lead; the step most often missed is seating the CPU power plug fully.

What maintenance will this supply need over its lifetime?

The Zero RPM fan stops at low load, so dust builds up more slowly; clean the intake grill with compressed air once a year and listen for bearing noise that would signal a fan replacement.

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