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

KHACHIMO

KHACHIMO 800W power supply 451B RHS451B-03

SKU CH-4X56-K9GK8

An 800W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for quiet, low-power sleep

  • TypeATX
  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode for silent low-load operation
  • Resonant LLC topology with DC-to-DC for clean power
  • ATX form factor fits standard desktop builds

800W ATX power supply

The KHACHIMO 800W unit delivers 80 PLUS Gold efficiency for desktop builds that need reliable power delivery. It suits system integrators and enthusiasts assembling mid-to-high-range workstations or gaming rigs. Modern Standby compatibility enables rapid wake-from-sleep and improved low-load efficiency. The resonant LLC topology with DC-to-DC conversion provides clean, consistent output across all rails.

Gold efficiency and silent operation

At low and medium loads the Zero RPM fan mode stops the fan entirely for near-silent operation. The 80 PLUS Gold rating reduces waste heat and lowers overall power draw during typical workloads. Resonant LLC topology with DC-to-DC conversion minimises coil whine and supports deeper sleep states. These features combine to keep temperatures down and acoustic output minimal in everyday use.

Upgrade path and fit

This unit replaces older Bronze-rated or group-regulated supplies that lack Modern Standby support and zero-fan capability. The jump is worthwhile when building a new ATX system that demands Gold-class efficiency and quiet idle behaviour. It is not for servers requiring redundant hot-swap modules or compact SFX-only chassis. Buyers needing higher wattage for multi-GPU configurations should look elsewhere.

Highlights

  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode for silent low-load operation
  • Resonant LLC topology with DC-to-DC for clean power
  • ATX form factor fits standard desktop builds

Specifications

TypeATX

Questions about this item

How do I install the 800W ATX power supply and which step do people get wrong?

Mount the unit in the case with the four screws, connect the 24-pin ATX, CPU and GPU cables, then switch the PSU on before pressing the case power button; the step often missed is forgetting to flip the rear I/O power switch after cabling.

What maintenance or replacement will the 800W unit need later?

The 80 PLUS Gold certified 800W supply uses a Zero RPM fan that stops at low load; over years dust can build up on the fan blades, so occasional compressed-air cleaning keeps the Zero RPM mode quiet and effective.

What limit appears first under sustained load on this 800W model?

The 800W continuous rating and 80 PLUS Gold efficiency set the thermal ceiling; prolonged full-load operation will hit the internal temperature protection before any voltage rail drops out of spec.

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