
The GameMax RGB-750 is a 750W, fully modular ATX 3.0 power supply with a single fan mode, priced at $99.99 USD from various online retailers.
We tested two units, both of which failed before completing our tests, leading us to not recommend the product. The results presented are partial, and we cannot guarantee its reliability under high loads or its potential impact on your computer. As of publication date, we have contacted GameMax support but have not received a response.
WHAT YOU NEED TO KNOW
THE GOOD
- Nothing at the time of writing
THE BAD
- Warranty
The 5-year warranty is shorter than average for similarly priced and rated power supplies.
- Performance
In limited testing the power supply has low noise and good load regulation, but its efficiency is not as advertised.
- Failed Testing
Testing was incomplete due to hardware failures. This happened with two units ordered at different times.
THE REST
- RGB
The RGB can be controlled with Aura Sync, but it may not be very visible in most computer cases.
- Overall
Labs does not recommend this PSU. Both units tested failed before completing the full test suite. As a result, we cannot ensure its performance under high loads or its potential impact on your computer.
In the box, it includes standard items, such as average cables with regular rubberized insulation. It also comes with a 24-pin testing connector, which, despite being basic in build quality, is handy for testing purposes (if you can manage to test it). Additionally, it has a 140mm fan, which should provide adequate cooling for the power supply.
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Front of the box.
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Power input side of the PSU.

Top of the PSU displaying the fan.

Bottom of the PSU displaying the specifications.
+12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
---|---|---|---|---|---|
CURRENT | 60 A | 20 A | 20 A | 2.5 A | 0.5 A |
WATTAGE | 720 W | 100 W | 12.5 W | 6 W | |
750 W |
Please note that the above ratings are manufacturer advertised specifications.
The power supply has a single fan mode and features Addressable RGB lighting that can be controlled with Aura Sync, though it is not very visible in most computer cases. It also includes an RGB button on the unit itself. It comes with all the standard protections expected in a power supply, which typically allow the unit to recover to a normal state after any protection is triggered. While it is difficult to determine if any of the faults we experiences would cause harm to users or equipment, we did not observe any fire or shock hazards.
The power supply exhibited low voltage ripple, particularly with a 230V input, but we were unable to complete the 115V testing due to the units' unreliability. It performed poorly in excursion testing with voltages fluctuating wildly and going out of the acceptable range. Instances where the power supply shut down during testing are marked by boxes with no traces and the 'Failed' annotation, indicating that it couldn't sustain the load.
These results are good demonstrations of extreme and undesirable reactions to load changes, highlighting what you don't want your power supply to do. The components in your computer expect a cleaner power than this unit provides and may not operate correctly or could shut down if subjected to such unstable power.
As for Load Regulation, while the regulation is reasonable, the -12V rail is notably erratic.
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This power supply is not highly efficient, as it fails to meet the advertised 80PLUS Gold rating at any point during its load curve, performing closer to a Bronze rating. During brownout tests, it lost power quickly, signaling the computer to shut down with brief drops in input power. However, when it did shut down, there was sufficient time between the "power good" line going low and the failure of the output rails, preventing components from losing power unexpectedly.
In our testing, the first unit failed during the 20°C Efficiency stage, which is why the 40°C results are blank, and it did not reach the Over Current Protection (OCP) stage. The second unit failed during the 20°C OCP stage, resulting in a blank OCP graph.
