Cooler Master GX III 1050W ATX v3.0 PSU Review

The Cooler Master GX III 1050W is a strong PSU, equiped with a single 12+4 pin connector/cable set for 600W max power delivery, supporting all modern power-hungry GPUs. Behind this PSU is a newcomer in the desktop PSU business, Lite-On, mostly known for its power adapters. 

The Cooler Master GX III 1050W is included in my best ATX v3.x & PCIe 5.x PSU picks article.

After the GX III 1250W, the time has come for the 1050W model to meet my test bench. This is also based on the same platform provided by Lite-On, which strongly desires to enter the desktop PSU market, something not as easy as it sounds, even for a huge company with many resources. Cooler Master is one of the few big brands I know, working with so many OEMs simultaneously, which has several advantages but disadvantages, too, requiring strong control of the manufacturing process to keep everything in line. The GX III 1050W is an ATX v3.0 and PCIe 5.0 certified unit, meaning it has a 12VHPWR header on its modular panel. Replacing it with a 12V-2×6 can meet the newest ATX v3.1 and PCIe 5.1 specifications, so CM should soon do that.

The GX III 1050 has Platinum efficiency in the Cybenetics scheme and a Cybenetics Standard+ (35-40 dB[A]) noise rating that looks weird because the stronger 1250W unit has a better noise rating. CM informed me that its engineers will adjust all GX III models to make them less noisy. Once this is finished, Cybenetics will re-check all models and provide the new noise ratings.

The unit’s dimensions are compact, with a depth of 160mm, which is low for its 1250W max power. Moreover, CM used a Hong Hua fan, which seems to be the standard for today’s high-end PSUs. Lastly, the provided warranty is ten years long, meeting the competition’s terms.


Technical Specifications:
  • Manufacturer (OEM): Lite-On
  • Max Power: 1050W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%)
  • 80 Plus Efficiency: Gold
  • Noise [115V]: Cybenetics Standard+ (35-40 dB[A])
  • Compliance: ATX v3.0, EPS 2.92
  • Operating Temperature (Continuous Full Load): 0 – 50 °C
  • Alternative Low Power Mode support: Yes
  • Power 12V combined: 1050W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 120W
  • Power 5VSB: 15W
  • Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525H12F-Z)
  • Semi-Passive Operation: ✓
  • Modular Design: Yes (Fully)
  • High Power Connectors: 2x EPS (2x cables), 3x PCIe 6+2 pin (3x cables), 1x PCIe 12+4 pin (600W)
  • Peripheral Connectors: 12x SATA (3x cables), 4x 4-pin Molex (single cable)
  • ATX Cable Length: 610mm
  • EPS Cable Length: 600mm
  • 6+2 pin PCIe Cable Length: 550mm
  • 12+4 pin PCIe Cable Length: 650mm
  • Distance between SATA / 4-pin Molex: 120mm
  • In-cable capacitors: No
  • Dimensions (W x H x D): 150 mm x 85 mm x 160mm
  • Weight: 1.87 kg (4.12 lb)
  • Warranty: ten years
  • Street price (excluding VAT): ?

Power Specifications

Rail 3.3V 5V 12V 5VSB -12V
Max. Power Amps 20 20 87.5 3 0.3
Watts 120 1050 15 3.6
Total Max. Power (W) 1050
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2 thoughts on “Cooler Master GX III 1050W ATX v3.0 PSU Review

  1. It is Platinum in Cybenetics, while Gold in 80 PLUS. Cybenetics measures efficiency using a different approach than 80 PLUS, taking thousands of measurements instead of only 3-4.

    So the 1050 is Cybenetics Platinum, while the 1250 is Cybenetics Gold.

  2. Hi, confused on the review. In the first page it alludes to the 1250W version and also says it’s Platinum efficiency but specs and picture shows Gold.

    If its 1050W, ATX 3.0 and Platinum, it would be the perfect one for me so unsure on the details provided. Thanks.

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