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Silver rectangular Flex ATX power supply unit with fan grille and cable bundle

KHACHIMO

KHACHIMO ST-220FUB-05E 220W Flex ATX Power Supply

SKU CH-WR00-3964M

A 220 W Flex ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for compact builds

  • TypeATX
  • Modern Standby support for near-instant wake from sleep
  • 80 PLUS Gold efficiency reduces power draw and heat output
  • Zero RPM fan mode delivers silent operation at low loads
  • Resonant LLC with DC-to-DC topology provides clean, stable power
  • Flex ATX form factor fits compact 1U and small-form-factor builds

Compact 220 W Flex ATX unit

The KHACHIMO ST-220FUB-05E is a 220 W Flex ATX power supply built for small-form-factor PCs, thin clients and 1U server chassis. It carries 80 PLUS Gold certification and supports Modern Standby for rapid wake times and improved low-load efficiency. A resonant LLC topology with DC-to-DC conversion delivers clean power while reducing coil whine. At light and medium loads the fan stops completely for silent running.

Ideal for space-constrained builds.

This unit suits builders assembling compact workstations, digital-signage players or embedded appliances where a 220 W Flex ATX form factor is required. Buyers planning to run discrete graphics cards, multiple drives or overclocked CPUs should look at higher-wattage ATX or SFX designs instead. Systems needing redundant or hot-swap power modules are also outside the intended use case.

Verify Flex ATX fit and connector needs

Confirm that your chassis accepts a Flex ATX power supply and that the motherboard power connectors match the unit’s fixed cable set. Check the total system power draw against the 220 W rating before ordering. Ensure the case ventilation can handle the supply’s airflow direction when the fan is active.

Highlights

  • Modern Standby support for near-instant wake from sleep
  • 80 PLUS Gold efficiency reduces power draw and heat output
  • Zero RPM fan mode delivers silent operation at low loads
  • Resonant LLC with DC-to-DC topology provides clean, stable power
  • Flex ATX form factor fits compact 1U and small-form-factor builds

Specifications

TypeATX

Questions about this item

What type of motherboard power connector does this 220W Flex ATX unit require?

It uses the standard ATX connector, so any motherboard with a matching ATX power socket will work without adapters.

Will the Zero RPM fan mode stay off when paired with an older, less efficient CPU?

The fan stops at low and medium loads; an older CPU may draw enough power to keep the load above the threshold, causing the fan to spin.

How can I confirm the 80 PLUS Gold efficiency is active after installation?

Monitor power draw at the wall under typical load; the unit should draw noticeably less AC power than a non-certified supply for the same DC output.

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