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Rectangular black ATX power supply unit with cooling fan grille

KHACHIMO

KHACHIMO 550W ATX Gold Power Supply L550E-S1

SKU CH-BGTC-DH5JZ

A 550W ATX power supply with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for fast wake times and quiet operation

  • Product typeATX
  • Modern Standby support enables extremely fast wake-from-sleep
  • 80 PLUS Gold certification lowers power draw and reduces 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 cuts coil whine
  • 550 W ATX output powers compatible Dell R430, R330, R340, R440 and DS1500 systems

550W ATX Gold Power Supply

The KHACHIMO L550E-S1 is a 550W ATX power supply built for modern desktop systems that demand efficient and stable power delivery. It carries 80 PLUS Gold certification and supports Modern Standby for rapid wake-from-sleep performance.

Resonant LLC Topology with DC-to-DC Conversion

This topology provides clean, consistent power while reducing coil whine for quieter operation and enabling more energy-efficient sleep states. The Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent running.

Upgrade from lower-efficiency or noisy units

The jump is worth it when replacing a supply that lacks Gold-rated efficiency, Modern Standby support, or a semi-passive fan mode. It is not for builds requiring higher wattage than 550W or server-grade redundancy features.

How it compares

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

Price $184.99
Pricier than about 60% 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

Does this 550W ATX power supply support Modern Standby for fast wake-from-sleep?

Yes, it is Modern Standby compatible, giving extremely fast wake-from-sleep times and better low-load efficiency.

Will this unit fit a standard ATX case and what mounting pattern does it use?

It follows the ATX form factor, so it mounts in any standard ATX chassis using the usual four-screw pattern on the rear panel.

How do I enable the Zero RPM fan mode and what load range keeps the fan off?

The fan stops automatically at low and medium loads; no software or BIOS setting is needed — just ensure the PSU fan can draw cool air.

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