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Silver 1U rackmount power supply unit with rear fan grille and power socket

KHACHIMO

KHACHIMO Standard 1U Switching 550W Power Supply P1H-5550V

SKU CH-NHHP-CYB3N

ATX 550 W unit with 80 PLUS Gold efficiency, Modern Standby support, Zero RPM fan mode and resonant LLC topology for quiet, stable power

  • TypeATX
  • 80 PLUS Gold certification cuts power draw and heat
  • Zero RPM fan mode stops the fan at low loads for silent running
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • Modern Standby support enables faster wake-from-sleep and better low-load efficiency
  • 550 W ATX output in a 1U form factor fits compact server builds

1U 550W ATX Power Supply

The KHACHIMO P1H-5550V is a 1U form-factor ATX power supply rated at 550W. It targets system builders assembling compact servers or workstations where rack height is restricted. The unit carries 80 PLUS Gold certification and supports Modern Standby for rapid wake-from-sleep transitions. It is not suited for builds requiring higher wattage headroom or redundant power modules.

Thermals Noise and Power Draw

80 PLUS Gold certification ensures high efficiency during normal operation, reducing waste heat and overall power consumption. A Zero RPM fan mode stops the cooling fan completely at low and medium loads, delivering near-silent running. Resonant LLC topology with DC-to-DC conversion maintains clean power delivery and suppresses coil whine while enabling deeper, more efficient sleep states.

Modern Standby and Topology Benefits

Modern Standby compatibility provides extremely fast wake-from-sleep times and improves low-load efficiency for always-connected workflows. The resonant LLC and DC-to-DC architecture reduces coil whine, contributing to quieter operation under varying loads. These features combine to lower acoustic output and support energy-efficient idle behaviour without additional configuration.

Highlights

  • 80 PLUS Gold certification cuts power draw and heat
  • Zero RPM fan mode stops the fan at low loads for silent running
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • Modern Standby support enables faster wake-from-sleep and better low-load efficiency
  • 550 W ATX output in a 1U form factor fits compact server builds

Specifications

TypeATX

Questions about this item

How do I install the 550W ATX unit in a 1U rack chassis and what step is often missed?

Mount the 1U form-factor supply with the four chassis screws, connect the 24-pin ATX and CPU power cables, then verify the motherboard BIOS has Modern Standby enabled so the fast wake-from-sleep feature actually works.

What maintenance will the P1H-5550V need over time?

The Zero RPM fan stops at low and medium loads, so dust builds up more slowly; plan to blow out the heatsink fins once a year and listen for bearing noise that would signal a future fan replacement.

What limit appears first when the 550W supply runs at sustained high load?

The 80 PLUS Gold efficiency target is met up to full rated output, so the first constraint is the 550W ceiling — exceeding it triggers over-power protection and shuts the unit down.

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