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Compact silver 1U Flex ATX power supply unit with rear fan grille and cable bundle

KHACHIMO

KHACHIMO ST-220FUB-05E 1U 220W Flex ATX Power Supply

SKU CH-28V1-37CVF

A 220 W Flex ATX power supply with 80 PLUS Gold efficiency, Modern Standby support, Zero RPM fan mode and resonant LLC topology with DC-to-DC conversion for clean, quiet power

  • TypeATX
  • Fast wake from sleep with Modern Standby support
  • High efficiency cuts power draw and heat with 80 PLUS Gold
  • Silent operation at low loads via Zero RPM fan mode
  • Clean, stable power delivery through resonant LLC with DC-to-DC
  • Compact 1U Flex ATX form factor fits small chassis

Compact 1U 220W Flex ATX Power Supply

This KHACHIMO Flex ATX unit fits 1U and small-form-factor cases where a standard PSU will not install. It delivers 220W of continuous power for thin clients, embedded systems, or low-profile desktop builds. The 80 PLUS Gold rating keeps efficiency high and waste heat low in tight enclosures.

Replaces older Flex ATX units without Modern Standby

Swapping out an earlier Flex ATX supply that lacks Modern Standby support gives faster wake-from-sleep and better low-load efficiency. The resonant LLC topology with DC-to-DC conversion also reduces coil whine and enables deeper sleep states. The upgrade is worthwhile when the existing unit cannot meet current standby requirements or runs audibly loud at idle.

Verify case clearance

Measure the available depth in your chassis to confirm a 1U form factor will seat without cable interference. Check that the 5-wire harness matches the motherboard power headers used by your platform. Ensure the total system draw stays within the 220W rating so the zero-RPM fan mode can engage at low and medium loads.

Highlights

  • Fast wake from sleep with Modern Standby support
  • High efficiency cuts power draw and heat with 80 PLUS Gold
  • Silent operation at low loads via Zero RPM fan mode
  • Clean, stable power delivery through resonant LLC with DC-to-DC
  • Compact 1U Flex ATX form factor fits small chassis

Specifications

TypeATX

Questions about this item

What form factor does this 1U 220W unit use so I can confirm it fits my chassis?

The power supply follows the Flex ATX form factor, which is designed for 1U and small-form-factor cases that accept Flex ATX units.

Which cables must be connected during installation to enable Modern Standby, and what is the common mistake?

Connect the 24-pin ATX motherboard cable and the 4-pin or 8-pin CPU power cable; the step often missed is seating the CPU power connector fully so Modern Standby wake signals work reliably.

The 80 PLUS Gold fan has a Zero RPM mode — how do I know when the fan bearing needs replacement?

Listen for new rattling or grinding noises once the fan spins up under load; if the noise persists after dust removal, the bearing is wearing and the fan should be replaced.

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