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Rectangular ATX power supply with matte black finish and flat black cables, 120mm fan visible

NO.

NO. ET550-B 550 watt 80 PLUS Bronze ATX power adapter

SKU CH-MNJK-QW28H

Delivers 550 watts of 80 PLUS Bronze certified power with a single +12 V rail, 120 mm fan running at 18 dBA, and flat black cables for tidy builds

  • Efficient power delivery with 80 PLUS Bronze certification
  • Continuous 550 watt output at 40 operating temperature
  • Stable single +12V rail with PCI-E 8pin and 6pin connectors
  • Quiet 120mm fan running at 18 dBA
  • Clean cable routing with all-black flat cables

Essential Series 550 W ATX Power Supply

The NO. ET550-B is a 550 watt ATX power supply built for system builders who need reliable 24/7 operation at up to 40 °C. It carries 80 PLUS Bronze certification and delivers its full rated output through a single +12 V rail. The unit uses all-black flat cables to simplify routing inside the case.

Replaces older group-regulated or uncertified units

The jump is worth it when the existing supply cannot sustain continuous load at elevated temperatures or lacks dedicated PCIe connectors. This model adds 80 PLUS Bronze efficiency, a single +12 V rail, and both 8-pin and 6-pin PCIe plugs so modern graphics cards can be powered without adapters.

Sustained load at 40 °C with 18 dBA fan noise

The 120 mm fan runs at a rated 18 dBA while the supply maintains continuous 550 W output at 40 °C ambient temperature. Efficiency stays within 80 PLUS Bronze limits during extended sessions, and the single-rail design keeps +12 V voltage stable without the cross-load issues seen in multi-rail designs.

Highlights

  • Efficient power delivery with 80 PLUS Bronze certification
  • Continuous 550 watt output at 40 operating temperature
  • Stable single +12V rail with PCI-E 8pin and 6pin connectors
  • Quiet 120mm fan running at 18 dBA
  • Clean cable routing with all-black flat cables

Specifications

No published specifications for this item yet.

Questions about this item

Will the 120 mm fan and flat black cables fit a standard ATX case?

The unit follows ATX dimensions with a 120 mm fan and flat black cables designed for standard case routing.

How do I connect the PCI-E 8-pin and 6-pin connectors without daisy-chaining?

Plug each PCI-E 8-pin and 6-pin lead directly from the power supply into the graphics card; do not use a single cable for both connectors.

When should I clean the 120 mm fan to keep noise near 18 dBA?

Vacuum the fan intake every six to twelve months depending on dust levels to maintain the rated 18 dBA acoustic performance.

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