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Rectangular black ATX power supply unit with side fan grille and modular cable sockets

KHACHIMO

KHACHIMO FSP 550W ATX Power Supply ATX-550PNR

SKU CH-9WC7-2HVNR

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

  • Product typeATX
  • 80 PLUS Gold certification cuts power draw and keeps the unit cooler
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent running
  • Modern Standby compatibility gives extremely fast wake-from-sleep and better low-load efficiency
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • 550 W ATX output powers standard desktop builds with reliable headroom

550W ATX Power Supply

The KHACHIMO FSP 550W ATX-550PNR is a new ATX power supply rated at 550W output. It targets desktop builders who need reliable power for mid-range components and want certified efficiency without excess capacity. The unit supports Modern Standby for faster wake times and improved low-load efficiency.

80 PLUS Gold Efficiency Limits

Certification at the 80 PLUS Gold level guarantees high efficiency across typical loads, reducing power draw, heat output and fan noise. The resonant LLC topology with DC-to-DC conversion delivers clean, consistent power and enables deeper sleep states. Efficiency drops outside the certified load range, so very light or peak loads will not meet the same figures.

Build Quality and Connectors

Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent operation, while the topology reduces coil whine. The ATX form factor fits standard cases and the fixed cable set covers typical motherboard, CPU and peripheral connectors. Builders needing modular cables or higher wattage for multi-GPU configurations should look elsewhere.

How it compares

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

Price $192.99
Pricier than about 62% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

What does the 550W rating mean for my build?

The 550W rating is the maximum continuous power the unit can deliver to your components. It supports mid-range CPUs and graphics cards while leaving headroom for peaks.

How does the 80 PLUS Gold certification affect daily use?

80 PLUS Gold means the supply runs at high efficiency across typical loads, so it draws less power from the wall, generates less heat and keeps fan noise lower.

What ATX version does this unit follow and what does that limit?

It follows the ATX form factor, which defines the physical size, mounting holes and standard connector set that fit regular desktop cases and motherboards.

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