Cooler Master GX III 750W ATX v3.0 PSU Review

The Cooler Master GX III 750W is a mid capacity PSU, equiped with a single 12+4 pin connector/cable set for 300W max power delivery, supporting mid-level GPUs. The OEM of this unit is Lite-On, one of the largest manufacturer of power adapters, which tries to make an entry into the desktop PSU market. 

The Cooler Master GX III 750W is included in my best ATX v3.x & PCIe 5.x PSU picks article.

I have evaluated so far the following members of the GX III family:

The GX III 750W is made by Lite-On, which is trying to enter the desktop PSU market, making its debut with Cooler Master. Like the other family members, with capacities ranging from 750W to 1250W, it complies with ATX v3.0 and PCIe 5.0. The change to ATX v3.1 and PCIe 5.1 is small since all CM has to do is to inform Lite-On to change the header on the PSU’s modular panel from 12VHPWR to 12V-2×6 since the corresponding cable (as it is called so far) remains unchanged.

The GX III 750 has Platinum efficiency in the Cybenetics scheme and a  Cybenetics A- (25-30 dB[A]) 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 standard for a 750W unit, with a depth of 160mm. Instead of the Hong Hua fan used in the higher-capacity GX III model, I found that CM used a mediocre Yate Loon fan in the 850W and 750W members of the GX III family. I’m afraid I have to disagree with this change, and I am skeptical about whether this fan will be able to outlive the extended warranty.


Technical Specifications:
  • Manufacturer (OEM): Lite-On
  • Max Power: 750W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%)
  • 80 Plus Efficiency: Gold
  • Noise [115V]: Cybenetics A- (25-30 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: 750W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 120W
  • Power 5VSB: 15W
  • Cooling: 135mm Hydraulic Dynamic Bearing Fan (Yate Loon D14SH-12)
  • 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 (300W)
  • Peripheral Connectors: 8x SATA (2x 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: 1.68 kg (3.7 lb)
  • Warranty: ten years
  • Street price (excluding VAT): $141

Power Specifications

Rail 3.3V 5V 12V 5VSB -12V
Max. Power Amps 20 20 62.5 3 0.3
Watts 120 750 15 3.6
Total Max. Power (W) 750
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