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

Lian Li

Lian Li RB 750W power supply, 80 Plus Bronze, ATX 3.1, PCIe 5.1, 135mm fan, non-modular, black

SKU CH-MBR7-PKXXN

A 750 W ATX 3.1 power supply with 80 Plus Bronze efficiency, PCIe 5.1 support, a 135 mm fan and built-in cable channels

  • Max wattage750 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 750W

  • 750 W continuous output at 40 °C for stable high-load performance
  • 80 Plus Bronze certification reaching 85 % efficiency to reduce waste heat
  • ATX 3.1 platform with PCIe 5.1 12+4 pin connector ready for modern GPUs
  • 135 mm hydraulic-bearing fan optimised for low-noise cooling under typical use
  • Built-in cable routing channels and Velcro straps keep excess wires tidy for better airflow

750W ATX 3.1 power supply for modern PCs

This 750W unit targets builders assembling gaming or creator systems that need ATX 3.1 compliance and a native 12+4pin connector. It delivers continuous rated output at 40°C ambient temperature with active PFC above 0.95 at 115Vac. The 80 PLUS Bronze rating confirms up to 85% efficiency under typical loads.

Non-modular design with built-in cable routing

All cables are fixed to the unit, including a 20+4pin main connector, two EPS 4+4pin cables, one PCIe 6+2pin, one 16pin to 6+2pin adapter and one 12+4pin cable rated for 450W. SATA and peripheral leads are also attached. Integrated routing channels and Velcro straps on the housing help secure excess length behind the motherboard tray for cleaner airflow.

Replaces older Bronze units lacking ATX 3.1

The jump is worthwhile when a build requires the 12+4pin interface for newer graphics cards or when the platform demands ATX 3.1 transient response. It also suits systems moving up from lower-wattage Bronze models that cannot sustain 750W continuously at 40°C. Builders who need fully modular cabling or higher efficiency ratings should look elsewhere.

How it compares

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

Price $49.99
Cheaper than about 91% of the 10,869 comparable items (median $142.99).
Max wattage 750 W
Lower than about 60% 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)
Power
Max wattage750 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 frequency10A, 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

What does the ATX 3.1 standard cap in practice for this unit?

The PSU follows the ATX 3.1 specification and includes a native 12+4pin connector rated for 450 W, supporting PCIe 5.1 graphics cards.

What clearance does the 150 mm deep housing need in the case?

The unit measures 150 mm wide, 86 mm high and 150 mm deep, so the case must accept a standard ATX power supply of that depth.

How do the fixed cables connect, and which step is often missed?

All cables are permanently attached; plug the 20+4 pin main, both 4+4 pin EPS, the 6+2 pin PCIe, the 12+4 pin PCIe and the SATA/peripheral leads, then use the built-in routing channels and Velcro straps to secure excess length.

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