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Rectangular black metal ATX power supply unit with a cooling fan grille and model labels visible

KHACHIMO

KHACHIMO X3550 X3650 M4 550W Power Supply

SKU CH-2GA6-865JN

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

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • Lower power draw and heat via 80 PLUS Gold efficiency
  • Near-silent operation thanks to Zero RPM fan mode
  • Clean, stable power delivery using resonant LLC with DC-to-DC conversion
  • Compatible with X3550, X3650 M4 systems using part numbers 43X3311, 43X3312, 94Y8109, 94Y8110

Compatible Server Power Supply

The KHACHIMO 550W unit replaces the FSA011 module in X3550 and X3650 M4 servers. It fits the original chassis slot without modification and delivers the rated output for standard workloads. Part numbers 94Y8109, 94Y8110, 43X3311 and 43X3312 are direct cross-references.

Thermals and Acoustics

80 PLUS Gold certification means high efficiency at typical loads, reducing waste heat and keeping internal temperatures lower. The Zero RPM fan mode stops the cooling fan completely at low and medium power draw for near-silent operation. Resonant LLC topology with DC-to-DC conversion further cuts coil whine and supports efficient sleep states.

Build and Connectivity

Modern Standby compatibility enables extremely fast wake-from-sleep transitions and better low-load efficiency. The ATX form factor uses the standard server power connector for a secure, tool-free fit. Robust internal construction supports continuous operation in rack environments. No additional cables or adapters are required for installation.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • Lower power draw and heat via 80 PLUS Gold efficiency
  • Near-silent operation thanks to Zero RPM fan mode
  • Clean, stable power delivery using resonant LLC with DC-to-DC conversion
  • Compatible with X3550, X3650 M4 systems using part numbers 43X3311, 43X3312, 94Y8109, 94Y8110

Specifications

TypeATX

Questions about this item

How do I install this 550W ATX power supply and which step is often missed?

Mount the unit in a standard ATX case, connect the 24-pin motherboard and CPU power cables, then enable Modern Standby in the UEFI so the fast wake-from-sleep feature actually works.

What maintenance will this power supply need over its life?

The Zero RPM fan mode keeps the fan off at low loads, so dust builds up slowly; clean the intake grill with compressed air once a year and the fan bearings are rated for continuous operation without lubrication.

What limit appears first when this 550W unit runs at sustained high load?

The 80 PLUS Gold efficiency target is the first ceiling; above roughly 80 % load the efficiency curve flattens, waste heat rises and the fan must spin up, capping continuous output before the 550 W rating is reached.

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