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

KHACHIMO

KHACHIMO 531 1U 300W ATX Power Supply

SKU CH-88TR-Q0HF8

A 1U ATX power supply rated 300 W with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support

  • TypeATX
  • Modern Standby support for fast wake-from-sleep
  • 80 PLUS Gold efficiency lowers power draw and heat
  • Zero RPM fan mode keeps operation near-silent at low loads
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 1U ATX form factor rated 300 W continuous, 400 W peak

Compact 1U ATX Power Supply

The KHACHIMO 531 is a 1U form-factor ATX power supply rated for 300 W continuous output with a 400 W peak capability. It is designed for slim chassis builds such as rackmount servers, compact workstations or small-form-factor PCs where vertical space is limited but standard ATX power connectors are still required.

Gold Efficiency and Quiet Thermals

80 PLUS Gold certification means the unit runs at high efficiency across typical loads, reducing waste heat and keeping internal temperatures lower. A Zero RPM fan mode stops the cooling fan completely at low and medium loads for near-silent operation, while resonant LLC topology with DC-to-DC conversion delivers clean power and minimises coil whine during normal use.

Modern Standby and Broad Compatibility

Modern Standby support enables extremely fast wake-from-sleep times and improved low-load efficiency for systems that use connected-standby states. The resonant LLC design with DC-to-DC conversion also allows the power supply to work with more energy-efficient sleep states, making it suitable for builds that prioritise quick resume and quiet idle behaviour.

Highlights

  • Modern Standby support for fast wake-from-sleep
  • 80 PLUS Gold efficiency lowers power draw and heat
  • Zero RPM fan mode keeps operation near-silent at low loads
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 1U ATX form factor rated 300 W continuous, 400 W peak

Specifications

TypeATX

Questions about this item

How do I install the KHACHIMO 531 1U 300W ATX power supply and what step is often missed?

Mount the 1U unit in the chassis with the supplied screws, connect the 24-pin ATX, CPU and peripheral cables, then enable Modern Standby in the BIOS so the fast wake-from-sleep feature actually works.

What maintenance or replacement will the KHACHIMO 531 300W PSU need later?

The Zero RPM fan only spins above low and medium loads, so dust builds up slowly; plan to clean the intake with compressed air once a year and replace the fan if bearing noise appears after several years.

What limit appears first on the KHACHIMO 531 300W unit under sustained heavy load?

Continuous output is rated at 300 W with an 80 PLUS Gold efficiency target; the peak rating of 400 W is only for short bursts, so sustained draws above 300 W will trigger over-current protection and shut the unit down.

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