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Black ATX power supply unit with cooling fan and cable bundle

KHACHIMO

KHACHIMO 420W ATX Power Supply YM-7421D

SKU CH-DR8V-850CJ

An 80 PLUS Gold ATX unit delivering 420 W with Modern Standby support, zero-RPM fan mode and resonant LLC plus DC-to-DC topology for clean, quiet power

  • TypeATX
  • Fast wake from sleep with Modern Standby support
  • Lower power draw and heat via 80 PLUS Gold efficiency
  • Silent low-load operation through Zero RPM fan mode
  • Clean, stable output from resonant LLC with DC-to-DC
  • Reduced coil whine for quieter overall system noise

420 W ATX Power Supply for Modern Standby Builds

This 420 W ATX unit delivers reliable power for mainstream desktops and workstations that use Modern Standby sleep states. Its 80 PLUS Gold certification ensures high efficiency across typical loads, reducing waste heat and electricity cost. The resonant LLC topology with DC-to-DC conversion provides clean, stable output for sensitive components. It suits builders who want efficient, quiet operation without chasing extreme wattage.

Thermals Noise and Power Draw in Normal Use

At low and medium loads the Zero RPM fan mode stops the fan completely, giving near-silent operation during office work or media playback. The 80 PLUS Gold rating means less energy is lost as heat, so the unit runs cooler and the fan spins up less often. Resonant LLC topology further reduces coil whine for a quieter acoustic profile. Power draw stays efficient thanks to Modern Standby optimisation at idle.

Build Quality and Connector Implications

DC-to-DC conversion and resonant LLC topology indicate a modern internal layout that minimises ripple and supports deeper sleep states. The ATX form factor fits standard chassis without proprietary mounting constraints. Modern Standby compatibility ensures fast wake times with supported motherboards and operating systems. Builders needing multiple high-power GPU connectors or server-grade redundancy should look elsewhere.

Highlights

  • Fast wake from sleep with Modern Standby support
  • Lower power draw and heat via 80 PLUS Gold efficiency
  • Silent low-load operation through Zero RPM fan mode
  • Clean, stable output from resonant LLC with DC-to-DC
  • Reduced coil whine for quieter overall system noise

Specifications

TypeATX

Questions about this item

How do I install this ATX power supply and what step do builders often miss?

Mount the unit in the case with four screws, connect the 24-pin ATX, CPU and GPU cables, then enable Modern Standby in the motherboard BIOS so the fast wake and low-load efficiency features actually work.

What maintenance will this 420W Gold unit need over its life?

The Zero RPM fan stops at low load, so dust builds up unseen; clean the intake grill and fan blades with compressed air once a year to keep the resonant LLC topology running cool.

What limit appears first when this supply runs at sustained load?

The 420 W continuous rating is the hard ceiling; exceeding it triggers over-power protection and shuts the unit down.

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