The Gamemax RGB PRO 750G delivered solid efficiency in a hands-on review, but its fan became loud at sustained full load and its 12 V over-current protection had little headroom. Testing published September 25, 2026, measured efficiency at 25°C ambient and separately tested noise at both 25°C and approximately 45°C.
Features, connectors and dimensions
The RGB PRO 750G is a fully modular 750 W ATX power supply, described as compliant with ATX 3.1 and PCIe 5.1. It has a native 12V-2x6 connector for a graphics card, and its chassis measures 165 × 150 × 86 mm. At 165 mm deep, it is 25 mm longer than the ATX design-guide recommendation cited in the review, so check the available PSU clearance in your case.
Gamemax rates the unit for 750 W at 40°C ambient and specifies a 20% output derating above that temperature, bringing the rated output to 600 W at the stated derating level. The RGB lighting forms a diffused halo beneath the fan grille. The glow is most visible with the PSU mounted fan-up, a position that can compromise intake airflow.
Efficiency, ripple and 12 V protection
At 25°C ambient, the review measured average efficiency of 90.8% at 230 VAC and 88.6% at 115 VAC. In power supplies, efficiency describes the share of input power delivered as output rather than lost during conversion.
Gamemax markets the RGB PRO 750G as 80 PLUS Gold. The review’s efficiency measurements cleared the cited Gold thresholds, while the model was not listed in the CLEAResult, Cybenetics or PPLP databases checked for the review. Measured efficiency and a database listing are separate facts.
At full load, the review measured 48 mV of ripple on the 12 V rail, compared with the 120 mV limit it cited. Ripple is the small fluctuation in a rail’s output voltage. It also measured the 12 V OCP trip point at 67 A, 5 A above the rail’s 62 A rating—a narrow margin.
| Measurement | Test condition | Reported result |
| Average efficiency | 25°C ambient; 230 VAC input | 90.8% |
| Average efficiency | 25°C ambient; 115 VAC input | 88.6% |
| 12 V ripple | Full load; 25°C ambient | 48 mV |
| 12 V OCP trip point | 62 A rated rail | 67 A |
| Noise | Sustained 750 W; 25°C ambient | Close to 50 dB(A) |
| Noise | Sustained 750 W; approximately 45°C ambient | 54.4 dB(A) |
Fan noise under sustained load
The fan runs continuously; the RGB PRO 750G has no fanless mode. At 25°C ambient, noise reached close to 50 dB(A) at sustained 750 W. In the separate test at approximately 45°C ambient, it reached 54.4 dB(A) at the same sustained output. That makes the unit a less appealing fit for a quiet build that regularly runs near full load.
Price and alternatives
The review listed a US MSRP of $105. That is the stated suggested retail price, not a current street price. The review characterized the MSI MAG A750GL PCIE5 and Corsair RM750e as quieter alternatives and said their certifications were recorded in public databases. They are worth comparing if lower noise and a database listing matter more to your build than the Gamemax’s RGB lighting.
The RGB PRO 750G’s strongest measured point is efficiency; its clearest practical drawback is high-load noise. At the review-stated $105 MSRP, its lighting may appeal to builders who prioritize an illuminated PSU, while quiet operation under sustained heavy load is a reason to consider another model.
