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Rectangular ATX power supply unit with matte black metal casing and rear fan grille

KHACHIMO

KHACHIMO 400W ATX Power Supply Sun U20 Ultra20 M2 API4PC01 300-1950-01 300-1794-03 80 PLUS Gold

SKU CH-CEMA-ABB6N

A 400W ATX power supply for Sun U20 and Ultra20 M2 systems with 80 PLUS Gold efficiency, zero-RPM fan mode and resonant LLC topology

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode gives silent low-load operation
  • Resonant LLC plus DC-to-DC topology delivers clean power
  • 400 W ATX unit built for Sun U20 Ultra20 M2

Built for Sun U20 and Ultra20 M2

This 400 W ATX power supply is a direct replacement for Sun U20 and Ultra20 M2 workstations. It matches the original API4PC01, 300-1950-01 and 300-1794-03 part numbers so the system powers on without adapter cables or pin-out changes. Buyers who need a different form factor or higher wattage for another platform will not be served by this unit.

Fits the original chassis and wiring

The unit slides into the factory power-supply bay and connects to the existing motherboard and drive connectors. Its ATX layout means standard 24-pin, CPU and peripheral cables are already routed for the Sun chassis, freeing the builder from sourcing custom harnesses or modifying the case. Systems that require redundant or hot-swap modules cannot use this single supply.

Sustained efficiency and quiet operation

80 PLUS Gold certification confirms high efficiency across typical loads, reducing waste heat during long work sessions. Resonant LLC topology with DC-to-DC conversion delivers stable voltages under continuous demand while suppressing coil whine. The Zero RPM fan mode keeps the cooling fan off at low and medium loads, so the workstation stays near-silent during extended idle or light compute periods.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode gives silent low-load operation
  • Resonant LLC plus DC-to-DC topology delivers clean power
  • 400 W ATX unit built for Sun U20 Ultra20 M2

Specifications

TypeATX

Questions about this item

How much continuous power can the 400W ATX unit deliver under sustained load?

The supply is rated for 400W continuous output, matching the 80 PLUS Gold efficiency certification.

Does the Zero RPM fan mode stay silent during all-day operation?

The fan stops completely at low and medium loads, and the 80 PLUS Gold rating keeps waste heat low enough for quiet running.

Which part numbers confirm this PSU fits a Sun U20 or Ultra20 M2?

Compatibility is listed for API4PC01, 300-1950-01 and 300-1794-03 — match one of these to your system.

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