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Black rectangular ATX power supply with 135mm fan and fixed cables

Lian Li

Lian Li RB 550W power supply

SKU CH-C3NZ-FFZ49

Delivers 550 W through an ATX 3.1 design with 80 PLUS Bronze efficiency, a 135 mm low-noise fan, and built-in cable routing for a tidy build

  • ColorBlack
  • TypeATX (ATX 3.1 Compatible)
  • Maximum Power550 W
  • Fans1 x 135 mm HYB Fan
  • PFCActive PFC, PF > 0.95 under full load @ 115Vac, 60Hz
  • Main Connector20+4Pin

Size 550W

  • Reliable 550 W output for modern builds backed by 80 PLUS Bronze efficiency up to 85 %
  • ATX 3.1 platform with PCIe 5.1 ready native 12+4 pin interface for current GPUs
  • Integrated cable routing channels and Velcro straps on the PSU housing keep excess length tidy for better airflow
  • 135 mm hydraulic-bearing fan tuned for low noise while delivering efficient cooling under typical loads
  • Five-year hardware protection with MTBF exceeding 100 000 hours and full safety approvals

Power Delivery for Modern Builds

The Lian Li RB 550W is a non-modular ATX 3.1 power supply rated for 550 W continuous output. It carries 80 PLUS Bronze certification with up to 85% efficiency and active PFC above 0.95. A single +12 V rail and DC-to-DC topology provide stable voltage regulation for gaming or creator systems.

Suited for Standard ATX Systems

Builders who want native PCIe 5.1 12+4 pin support and integrated cable routing channels with Velcro straps will benefit. Buyers who need fully modular cabling or higher wattage for multi-GPU configurations should look elsewhere.

ATX 3.1 and PCIe 5.1 Ready

The unit meets the Intel ATX 3.1 specification and includes a native 12+4 pin connector for modern graphics cards. A 135 mm hydraulic-bearing fan handles cooling, while protections cover OPP, OVP, SCP, OCP, UVP and OTP.

Highlights

  • Reliable 550 W output for modern builds backed by 80 PLUS Bronze efficiency up to 85 %
  • ATX 3.1 platform with PCIe 5.1 ready native 12+4 pin interface for current GPUs
  • Integrated cable routing channels and Velcro straps on the PSU housing keep excess length tidy for better airflow
  • 135 mm hydraulic-bearing fan tuned for low noise while delivering efficient cooling under typical loads
  • Five-year hardware protection with MTBF exceeding 100 000 hours and full safety approvals

Specifications

BrandLIAN LI
SeriesRB series
ColorBlack
TypeATX (ATX 3.1 Compatible)
Maximum Power550 W
Fans1 x 135 mm HYB Fan
PFCActive PFC, PF > 0.95 under full load @ 115Vac, 60Hz
Main Connector20+4Pin
ModularNon Modular
Energy-Efficient80 PLUS BRONZE Certified
ProtectionOPP/OVP/SCP/OCP/UVP/OTP
Input Voltage100 - 240 V
Input Frequency Range8A, 50-60Hz
MTBF>100,000 Hours
ApprovalsCE/CB/cTUVus/TÜV/FCC/BSMI/CCC/KCC/SAA+RCM
ConnectorsMain Power (20+4Pin)600mm * 1pc
ATX 12V (4+4Pin) EPS 4+4pin 650mm * 2pc
PCIe 6+2 600+150mm * 1pc
SATA (5Pin) / Peripheral (4Pin) SATA 400+150+150mm + PATA 150mm *1pc
Dimensions150mm(W)x86mm(H)x150mm(D)
Weight5 lbs

Other versions of this model

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Questions about this item

Will the 20+4 pin and 4+4 pin EPS cables reach the motherboard headers in an older ATX case?

The fixed 20+4 pin cable is 600 mm long and each 4+4 pin EPS cable is 650 mm, so they reach standard ATX motherboard positions in most older cases.

How can I verify the fan is running quietly after installation?

The 135 mm hydraulic-bearing fan spins at low speed under typical loads; listen for a gentle airflow sound and check that the fan blade is turning through the rear grille.

Which cables come attached and what extra connectors must I purchase?

The unit ships with a fixed 20+4 pin main cable, two 4+4 pin EPS cables, one 6+2 pin PCIe cable, and a combined SATA/peripheral cable; no modular cables are included and no separate cables are required for a standard build.

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