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Rectangular silver ATX power supply unit with cooling fan and cable bundle

KHACHIMO

KHACHIMO ST-550UAC-05G 550W ATX Power Supply

SKU CH-WRHX-DGR3V

An ATX 550W power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and resonant LLC topology for quiet, efficient power delivery

  • Product typeATX
  • Fast wake from sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Zero RPM fan mode keeps idle operation near-silent
  • Resonant LLC with DC-to-DC gives clean, stable power
  • 550 W ATX output handles mainstream builds

550W ATX Power Supply

The KHACHIMO ST-550UAC-05G delivers 550W of continuous power in a standard ATX form factor. It is built for desktop PCs that require efficient, reliable energy conversion for daily workloads and mainstream components.

80 PLUS Gold Efficiency

This unit replaces older Bronze-rated or unrated supplies where heat and wasted energy are concerns. The Gold certification and LLC resonant topology with DC-to-DC conversion make the upgrade worthwhile when lower electricity draw, reduced coil whine, and support for modern sleep states matter.

Zero RPM Fan Mode

The semi-passive cooling keeps the system near-silent at low and medium loads while Modern Standby compatibility ensures fast wake times. Headroom becomes tight for builds with multiple high-end graphics cards or heavy overclocking, where a higher-wattage unit would be required.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $198.99
Pricier than about 63% of the 10,869 comparable items (median $142.99).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Product typeATX

Questions about this item

What form factor and depth does this 550 W ATX supply use so I can confirm it fits my 2U chassis?

The unit is a 2U ATX switching power supply rated at 550 W; its depth matches standard 2U server racks.

Which cables must be connected during installation to enable Modern Standby and the 80 PLUS Gold efficiency?

Connect the 24-pin ATX, 8-pin EPS, and any required PCIe cables; the LLC resonant topology and DC-to-DC conversion handle the rest automatically.

How often should the fan bearings be inspected given the Zero RPM mode and Gold-rated efficiency?

With the fan stopping at low and medium loads, bearing wear is minimal; a visual check once every few years is sufficient.

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