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Silver 1U server power supply unit with rear fan grille and modular cable connectors

KHACHIMO

KHACHIMO PWS-981-1S 980W 1U Power Supply

SKU CH-MBRP-YSJYP

A 980W ATX power supply with 80 PLUS Gold efficiency, Modern Standby support, and a zero-RPM fan mode for silent low-load operation

  • TypeATX
  • Fast wake from sleep with Modern Standby support
  • High efficiency cuts power draw and heat with 80 PLUS Gold certification
  • Near-silent operation at low loads via Zero RPM fan mode
  • Clean, stable power delivery through resonant LLC topology with DC-to-DC conversion
  • 980W output in a compact 1U form factor for dense builds

Compact 1U server power supply

The KHACHIMO PWS-981-1S is a 980W ATX switching unit built for 1U rackmount chassis. It targets system integrators and IT teams who need high-density power in a single rack slot while maintaining standard ATX connectivity for modern server boards.

80 PLUS Gold efficiency with Zero RPM mode

Certified 80 PLUS Gold, the unit runs at high efficiency across typical loads to reduce waste heat and keep internal temperatures lower. A Zero RPM fan mode stops the cooling fan completely at low and medium loads, delivering near-silent operation during idle or light workloads. Modern Standby compatibility further improves low-load efficiency and enables extremely fast wake-from-sleep times.

Resonant LLC topology for sustained delivery

Resonant LLC topology with DC-to-DC conversion provides clean, consistent power output under continuous demand while reducing coil whine. The design supports energy-efficient sleep states and maintains stable voltages during prolonged heavy loads, making it suitable for always-on server deployments that rarely see light utilisation.

Highlights

  • Fast wake from sleep with Modern Standby support
  • High efficiency cuts power draw and heat with 80 PLUS Gold certification
  • Near-silent operation at low loads via Zero RPM fan mode
  • Clean, stable power delivery through resonant LLC topology with DC-to-DC conversion
  • 980W output in a compact 1U form factor for dense builds

Specifications

TypeATX

Questions about this item

How do I install the KHACHIMO PWS-981-1S in a 1U rack chassis and what step is often missed?

Slide the 1U unit into the rack bay, secure the mounting screws, then connect the 24-pin ATX, CPU and peripheral cables; the step often missed is verifying the voltage selector switch matches your local mains supply before powering on.

Which part of the PWS-981-1S will need replacement first and when?

The cooling fan is the only moving component; with Zero RPM Fan Mode it stays off at low and medium loads, so bearing wear is delayed — expect many years of service before a fan swap is required.

What limit appears first on the PWS-981-1S during sustained full-load operation?

The 980 W maximum output is the hard ceiling; the 80 PLUS Gold design keeps efficiency high and temperatures lower, but continuous draw at 980 W will hit the rated power limit before thermal protection engages.

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