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Black rectangular ATX power supply unit with cooling fan and cable bundle

KHACHIMO

KHACHIMO SM471 420W ATX Power Supply STW420-ABDD

SKU CH-9EMK-YAEG1

Delivers 420 W of 80 PLUS Gold certified ATX power with Modern Standby support, Zero RPM fan mode and resonant LLC topology for silent, efficient operation

  • TypeATX
  • Modern Standby compatibility enables faster wake-from-sleep times
  • 80 PLUS Gold certification reduces power consumption and heat output
  • Zero RPM fan mode stops the fan at low and medium loads for silent operation
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • 420 W ATX power supply supports modern energy-efficient sleep states

420W ATX Power Supply

The KHACHIMO SM471 delivers 420 watts of continuous power in a standard ATX form factor. It is built for mainstream desktop builds that require reliable, efficient energy delivery without excessive capacity overhead.

80 PLUS Gold Efficiency

Gold certification means the unit runs at high efficiency across typical loads, reducing waste heat and lowering electricity draw. The resonant LLC topology with DC-to-DC conversion supplies clean, stable voltages and helps minimise coil whine during operation.

Zero RPM Fan Mode

At low and medium loads the cooling fan stops completely, providing near-silent running for office or media-centre use. Modern Standby compatibility allows extremely fast wake-from-sleep transitions while maintaining low-power sleep states.

Highlights

  • Modern Standby compatibility enables faster wake-from-sleep times
  • 80 PLUS Gold certification reduces power consumption and heat output
  • Zero RPM fan mode stops the fan at low and medium loads for silent operation
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • 420 W ATX power supply supports modern energy-efficient sleep states

Specifications

TypeATX

Questions about this item

What does the 80 PLUS Gold certification on this 420 W ATX unit guarantee in practice?

It certifies the power supply meets Gold efficiency targets at typical loads, reducing wasted electricity, heat and fan noise.

What case clearance and mounting pattern does the KHACHIMO SM471 require?

It uses the standard ATX form factor, so it fits any case with an ATX PSU bay and four rear mounting screws.

Which cables must be connected during installation to enable Modern Standby and Zero RPM mode?

Connect the 24-pin ATX, 8-pin EPS and any required PCIe cables; the firmware then handles low-power states and fan-stop automatically.

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