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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

  • Max wattage550 W
  • Modular cablingNon Modular
  • Fan configuration1 × 135 mm HYB Fan
  • Power factor correctionActive PFC, PF > 0.95 under full load @ 115Vac, 60 Hz
  • Main power connector20+4Pin
  • Efficiency certification80 PLUS BRONZE Certified

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.

How it compares

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

Price $35.99
Cheaper than about 93% 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 nameLIAN LI
Product lineRB series
Product colorBlack
Product typeATX (ATX 3.1 Compatible)
Ports & slots
Connection typesMain Power (20+4Pin)600 mm * 1pc
ATX 12 V (4+4Pin) EPS 4+4pin 650 mm * 2pc
PCIe 6+2 600+150 mm * 1pc
SATA (5Pin) / Peripheral (4Pin) SATA 400+150+150 mm + PATA 150 mm *1pc
Power
Max wattage550 W
Modular cablingNon Modular
Power factor correctionActive PFC, PF > 0.95 under full load @ 115Vac, 60 Hz
Main power connector20+4Pin
Efficiency certification80 PLUS BRONZE Certified
Built-in protectionOPP/OVP/SCP/OCP/UVP/OTP
Supply voltage100–240 V
AC input frequency8A, 50-60 Hz
Size & build
Product dimensions150 mm(W)x86 mm(H)x150 mm(D)
Product weight5 lb (2.27 kg)
Environment & compliance
Regulatory approvalsCE/CB/cTUVus/TÜV/FCC/BSMI/CCC/KCC/SAA+RCM
More details
Fan configuration1 × 135 mm HYB Fan
Mean time between failures>100,000 h

Other versions of this model

2 more in the same range

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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