
The MSI MPG A1000G PCIE5 is a 1000 W, fully modular, ATX 3.1 power supply with an additional hybrid fan mode. With an MSRP of $199.99 USD on MSI’s online store, it is often available at lower prices through other retailers. Despite being updated to the latest ATX standards, testing revealed significant reliability concerns.
The first unit failed during the 3.3V OCP test, but it did not continue to the -12V test. There were no signs of problems prior to this point. The second unit failed at 110% load during the 40°C 90 V 47 Hz efficiency sweep test, also with no prior issues.
MSI is in the process of transitioning marketing and packaging, therefore some of the existing marketing is for ATX 3.0/PCIe 5.0, while in other places its listed as ATX 3.1/PCIe 5.1. MSI has confirmed that the only differences between the revisions are labeling and the inclusion of a 12V-2x6 cable in place of the 12VHPWR cable. There are no indications that this is a different model as the model number remains the same.
Both failed units were sent to MSI for further investigation, and they are continuing to investigate these failures. The results presented here are primarily based on the second unit, as testing for OCP and OPP was skipped in an attempt to gather data before it failed. Without completing the tests on either unit, we cannot recommend the MSI MPG A1000G PCIE5.
WHAT YOU NEED TO KNOW
THE GOOD
- Efficiency
The power supply performed well in comparison to the advertised claims. However, one of the units did fail during the power efficiency sweep tests.
THE BAD
- Failed Testing
Labs tested two units, and both encountered issues during different testing phases. Neither of the two units tested managed to complete the full suite of evaluations.
THE REST
- Overall
As both power supplies stopped functioning before we completed our tests, we cannot recommend this power supply. Interestingly, both units operated without any apparent issues until their respective failures occurred.
The MSI MPG A1000G PCIE5 is an ATX form factor power supply. In the Box, it includes minimal accessories, with only a cable bag, mounting bolts, and user documentation. The cables are primarily flat, with some sleeved for better cable management, and a 12V-2x6 cable rated for up to 600W is included.
The power supply is cooled by a 135 mm Fluid Dynamic Bearing fan. MSI does not specify an Operating Temperature range and we cannot verify this through testing.
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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 | 83.5 A | 22 A | 22 A | 3 A | 0.3 A |
WATTAGE | 1000 W | 120 W | 15 W | 3.6 W | |
1000 W |
Please note that the above ratings are manufacturer advertised specifications.
The MPG A1000G PCIE5 features an additional hybrid fan mode, which keeps the fan off until 40% of the full load is reached. Users can enable or disable this mode via a physical switch located at the rear of the unit.
The power supply includes all standard protections and is backed by a 10-year warranty.
In terms of performance, the MPG A1000G PCIE5 demonstrated good voltage ripple. The 12V rail delivered a peak-to-peak ripple of 27 mV at full rated load, while the 5V and 3.3V rails had ripple levels of 21 mV and 26 mV, respectively. Load regulation testing showed a voltage drop of 0.194 V on the 12V rail when operating across its full 1000 W range.
During power excursion tests at 0°C and 20°C, the power supply performed well overall, although it failed to regulate the 12V rail during the two fastest excursions. The voltage deviations were minor and unlikely to cause hardware failures.
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The MSI MPG A1000G PCIE5 is 80PLUS Gold certified and displayed excellent efficiency, often surpassing expectations at lower load levels. However, one unit failed during the 110% 90V 47Hz input power efficiency sweep test. The brownout tests demonstrated survival of a 13ms dropout at full load, though the unit struggled to maintain output voltage during longer dropouts, recovering momentarily before shutting down again.
In the OCP/OPP testing phase, the first unit failed on the 3.3V rail at approximately 140% of its rated load and could not recover. The second unit skipped these tests to collect other data before its eventual failure. The few OCP results that were obtained showed that protections triggered between 125% and 140% of the rated loads for the 12V, 5V, and 3.3V rails under 115V 60Hz input conditions.
We have omitted the OCP graph as neither unit completed the full OCP test.
