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Black rectangular ATX power supply unit with modular cable sockets and a single 135mm fan grille

ASUS

ASUS ROG-STRIX-550G 550 W power supply

SKU CH-WHW5-YRFW6 MPN ROG-STRIX-550G

A full-modular ATX12V unit delivers 550 W through a single +12 V rail, 80 Plus Gold efficiency and a 135 mm dual-ball fan in a 160 mm chassis

  • Max wattage550 W
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm Dual Ball Fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors2 × 6+2-Pin

Model ATX 80+ Gold (550W)

Edition Black

  • 550 W maximum power handles demanding builds
  • 80 PLUS Gold certification reduces energy waste
  • Full modular design keeps cables tidy
  • 135 mm dual ball fan bearings last longer
  • 160 mm compact length fits smaller cases

Power supply for compact builds

The ASUS ROG-STRIX-550G is a 550 W ATX12V unit built for systems that need reliable power in a short chassis. Its 160 mm length fits many small-form-factor cases while still delivering a single +12 V rail rated at 45 A. The 80 PLUS Gold rating confirms high efficiency across typical loads.

Full modular cabling eases installation

All cables detach from the unit so you connect only the 24-pin, two 4+4-pin CPU, two 6+2-pin PCIe, eight SATA and three peripheral leads you actually need. The 135 mm dual ball-bearing fan uses Axial-tech blades and a 0 dB mode that stops the fan at low load. A common oversight is forgetting to seat the 24-pin and both CPU connectors fully before first boot.

Single +12 V rail at 45 A decides compatibility

The entire 550 W capacity is available on one +12 V rail, so the 45 A limit is the figure that determines whether the PSU can handle your graphics card and CPU combination. Check your components' combined 12 V draw against this rating before purchasing.

How it compares

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

Price $64.99
Cheaper than about 82% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameASUS
Product lineROG Strix
Model nameROG-STRIX-550G
Product typeATX12 V
Graphics
SLI supportNo
CrossFire supportNo
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors8
Output type+3.3 V@20A, +5 V@20A, +12 V@45A, +5VSB@3A
Connection types1 x MB 24/20-pin
2 x CPU 4+4-pin
2 x PCI-E 6+2-pin
8 x SATA
3 x Peripheral
Power
Max wattage550 W
Modular cablingFull Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
Power factor correctionActive
Size & build
Product dimensions3.39 in × 5.91 in × 6.3 in
Product weight3.81 lb (1.73 kg)
Shipping weight3.08 kg
Package size305 × 188 × 119 mm
Compatibility
PSU length limit160 mm
In the box
Included itemsPower Cord x 1
Motherboard Power cable x 1 (610 mm)
CPU Cable x 2 (1000 mm)
PCI-E Cable x 2 (675 mm)
SATA Cable x 2 (810 mm/860 mm)
Peripheral x 1 (450 mm)
Join the ROG badge x 2
ROG logo magnet x 1
ROG label x 3
ROG Cable Tie x4
Cable Tie x8
Screws Package x1
*MB/ CPU/ PCI-E cables come with embedded capacitors in the middle.
More details
Fan configuration1 × 135 mm Dual Ball Fan

Other versions of this model

4 more in the same range

Questions about this item

How can I confirm the 135mm dual ball fan is running correctly after installation?

The 0dB Technology keeps the fan off at low loads; it spins up when the +12V rail draws more power, so you will hear it only under heavier demand.

Which cables are included and what must I source separately for a typical build?

The box supplies a 24/20-pin motherboard cable, two CPU 4+4-pin cables, two PCI-E 6+2-pin cables, eight SATA cables and three peripheral cables; no extra cables are required for standard ATX12V systems.

Should I choose the 550 W Gold unit or step up to a higher wattage for a single GPU setup?

With a single +12V rail rated at 45 A and two PCI-E 6+2-pin connectors, the 550 W model covers most mid-range graphics cards; only multi-GPU or extreme overclocking builds would need more headroom.

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