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Compact 1U ATX power supply in matte black metal finish with rear fan grille and cable bundle

KHACHIMO

KHACHIMO SPI350U4BG 350W ATX power supply

SKU CH-MK3Q-9R961

ATX 350W unit with 80 PLUS Gold efficiency, Modern Standby support, zero-RPM fan mode and resonant LLC plus DC-to-DC topology for clean power

  • TypeATX
  • Modern Standby support gives extremely fast wake-from-sleep and better low-load efficiency
  • 80 PLUS Gold certification delivers high efficiency for lower power consumption, less noise, cooler temps
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent operation
  • Resonant LLC topology with DC-to-DC conversion provides clean, consistent power and reduces coil whine
  • 350 W ATX power supply built for 1U SPI form factor systems

350W ATX PSU for compact builds

The KHACHIMO SPI350U4BG is a 350W ATX power supply designed for small-form-factor systems and 1U rack chassis. It targets builders who need reliable power in tight spaces without sacrificing modern efficiency standards.

80 PLUS Gold efficiency with Zero RPM mode

Certified 80 PLUS Gold, the unit delivers high efficiency across typical loads, reducing power draw, heat output and fan noise. A Zero RPM fan mode stops the cooling fan completely at low and medium loads for near-silent operation in quiet environments.

Resonant LLC topology for stable sustained output

Resonant LLC topology with DC-to-DC conversion provides clean, consistent power under continuous load while suppressing coil whine. Modern Standby compatibility enables fast wake-from-sleep transitions and efficient low-power states during extended idle periods.

Highlights

  • Modern Standby support gives extremely fast wake-from-sleep and better low-load efficiency
  • 80 PLUS Gold certification delivers high efficiency for lower power consumption, less noise, cooler temps
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent operation
  • Resonant LLC topology with DC-to-DC conversion provides clean, consistent power and reduces coil whine
  • 350 W ATX power supply built for 1U SPI form factor systems

Specifications

TypeATX

Questions about this item

How do I install the SPI350U4BG in a 1U chassis and which step is often missed?

Mount the unit with the four 1U screw holes, connect the 24-pin ATX and 4+4-pin CPU cables, then enable Modern Standby in the BIOS so the 80 PLUS Gold efficiency works at low load.

What maintenance will the SPI350U4BG need after extended use?

The Zero RPM fan mode keeps the fan off at low load, so dust builds up slowly; clean the intake grill with compressed air once a year and the fan bearings are rated for continuous operation.

What limit appears first when the SPI350U4BG runs at full 350 W continuously?

The 80 PLUS Gold rating guarantees 80 % efficiency at typical loads, so sustained 350 W output makes waste heat the first constraint — ensure the 1U case has adequate airflow.

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