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Rectangular ATX power supply unit with matte black finish and cooling fan grille

KHACHIMO

KHACHIMO HWS300-3 3.3V 60A 300W ATX power supply

SKU CH-ERM9-EZY8S

Delivers 300 W of 80 PLUS Gold ATX power with a 3.3 V 60 A rail, zero-RPM fan mode and Modern Standby support

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode gives silent operation at low loads
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 3 V rail supplies up to 60 A for demanding components

Purpose and audience

The KHACHIMO HWS300-3 is a 300W ATX power supply built for systems that draw modest power and value quiet, efficient operation. It suits office PCs, compact builds and upgrades where a lower-wattage unit fits the chassis and the load.

ATX power limits

At 300W total output the unit cannot support high-end graphics cards or heavily overclocked processors. The 3.3V rail is rated for 60A, so combined rail loading must stay within the overall 300W ceiling for stable delivery.

Build and connectors

80 PLUS Gold certification and resonant LLC topology with DC-to-DC conversion keep efficiency high and coil whine low. Zero RPM fan mode stops the fan at low and medium loads for near-silent running, while Modern Standby compatibility enables fast wake-from-sleep and deeper sleep states.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode gives silent operation at low loads
  • Resonant LLC with DC-to-DC delivers clean, stable power
  • 3 V rail supplies up to 60 A for demanding components

Specifications

TypeATX

Questions about this item

Should I choose the 3.3 V rail or the 300 W total when sizing this PSU?

The 300 W rating is the overall continuous power the unit can deliver, while the 3.3 V rail is limited to 60 A; both limits apply at the same time so size for the total system draw first.

What does the 80 PLUS Gold badge mean once the PSU is installed in my PC?

It certifies the supply meets 80 PLUS Gold efficiency targets, which translates to less waste heat and quieter fan behaviour under everyday loads.

How does the ATX form factor and resonant LLC topology affect cable routing and power delivery?

ATX dimensions ensure the unit fits standard cases and the resonant LLC design with DC-to-DC conversion delivers stable voltages across all rails for modern components.

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