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Black ATX power supply unit with gold efficiency badge and cooling fan visible

KHACHIMO

KHACHIMO CSU501B 80 PLUS Gold power supply

SKU CH-RCWD-QBAFW

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

  • TypeATX
  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stays off at low loads for silent running
  • LLC resonant topology with DC-to-DC gives clean power
  • Reduced coil whine for quieter operation

KHACHIMO CSU501B ATX power supply

The KHACHIMO CSU501B is an ATX power supply built for desktop PCs that need efficient, reliable power delivery. It carries 80 PLUS Gold certification and supports Modern Standby for rapid wake times and improved low-load efficiency. This unit suits system builders who want clean power without excess noise or heat.

Sustained-load behaviour

Under continuous load the resonant LLC topology with DC-to-DC conversion maintains stable voltages and reduces coil whine. The Zero RPM fan mode keeps the cooling fan off at low and medium loads, so the unit stays near-silent during typical workloads. Efficiency remains high across the operating range, limiting waste heat and keeping internal temperatures lower.

Straightforward ATX installation

Installation follows the normal ATX form factor, so the unit fits standard cases and motherboards without special brackets or adapters. Cable routing is conventional; the main issues arise only if the case has unusually tight clearance or non-standard mounting points. No proprietary connectors or software configuration are required.

Highlights

  • Faster wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stays off at low loads for silent running
  • LLC resonant topology with DC-to-DC gives clean power
  • Reduced coil whine for quieter operation

Specifications

TypeATX

Questions about this item

How loud does the CSU501B get when the system runs all day?

The Zero RPM fan mode stops the fan completely at low and medium loads for near-silent operation, and the 80 PLUS Gold efficiency keeps heat output low so the fan stays off longer.

What must my case and motherboard already provide for this ATX unit to work?

A standard ATX mounting cut-out, a 24-pin main power connector socket, and the usual CPU and PCIe power headers on the motherboard.

Will the CSU501B cause coil whine or sleep issues with my older GPU and motherboard?

The resonant LLC topology with DC-to-DC conversion reduces coil whine and supports modern sleep states, so it works cleanly with older components that follow ATX specs.

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