Conclusion

The GIGABYTE P750GM is the first power supply we have seen here at TheFPSReview from GIGABYTE. However, GIGABYTE has been one of the biggest names in the enthusiast community for some time now even though power supplies have not been their core business, or what many users are used to thinking of when they see the GIGABYTE name. However, given their product portfolio, it does make sense for them to offer PSUs as well and with a large industrial base, we have high hopes for their ability to do so well. The question is; do our hopes translate into reality? Let’s see.

Build Quality

Today’s GIGABYTE P750GM starts things off with a build quality that is decidedly mixed for its market position. The exterior represents a well-balanced and subtle approach that results in a not too striking and not too boring product. This is in addition to the fact that we get good cables and a nice finish. The integration is generally very clean. The component selection, however, is where things start to move towards the “what” category. True, we do get a Yate Loon hydraulic bearing fan and a Nippon Chemi-con primary cap. However, the secondary is filled out with unknowns from CODC and Chn Cap. Lastly, the documentation with this unit is a disaster and the variable 5-year warranty is not making those component selections look any better.

Load Testing

Today’s GIGABYTE P750GM started off testing in very good shape. We saw voltage regulation of up to 0.04v on the 12v rail, 0.06v on the 5v rail, and 0.07v on the 3.3v rail. These numbers would look to be excellent but, in reality, they are mixed with what we saw with the Phanteks AMP 750, generally trail the ASUS ROG STRIX 750W, and trail the EVGA SuperNOVA G5 750W.

We also saw efficiency values that ranged from 86.92% to 89.72% efficient at 120v AC input and 84.67% to 88.64% at 100v AC input. These are good, but they are not the best we have seen. When it came to the 80 Plus efficiency numbers, we did see the P750GM fall a bit short of its stated efficiency at 50% and 100% load. On the flip side, the P750GM did pass our Torture Test.

When we look at the Transient Load Tests results for the GIGABYTE P750GM, we see that the results are just a disaster. When directly loaded, the 12v rail showed a peak change of ~600mV, and the 5v rail had a peak change of ~70mV. During the 12v load, the unloaded 5v rail saw a peak change of ~65mV. In absolute terms, these results are bad and in relative terms, there are bad as well. This unit was only barely saved itself from going out of specification because of where the 12v set point was from the factory.

DC Output Quality

The DC Output Quality results for the GIGABYTE P750GM were excellent and probably the high point of the day. To start off, we saw peak ripple/noise values of just ~25mV of ripple/noise on the 12v rail, ~20mV on the 5v rail, and ~15mV on the 3.3v rail during our regular load tests. These values are well within specification limits and that means, at a minimum, excellent in absolute terms. In relative terms, these results were mixed with the Phanteks AMP 750 while matching the EVGA SuperNOVA G5 750W and being slightly better than the ASUS ROG STRIX 750W. This makes this unit competitive as it was in the middle of the pack of comparable 750W units we have seen to date.

Noise

Today’s GIGABYTE P750GM is not a tiny capacity unit, but it does have a fairly open design and it does have an OK fan. It is also supposed to be rather efficient (though not as efficient as advertised). So, how does it do in our testing?

Overall, it did well. Well, until Test #4 when it was running at full load. At that point, the unit was making a considerable amount of fan noise that easily made itself known in our test environment. On top of that, it developed a most irritating buzzing sound. During all of our tests below this, however, it was rather unremarkable in our load testing environment. So, it would seem, the unit does well unless you try to push it to its limits.

Final Points

The GIGABYTE P750GM is an ok to decent unit overall. It never really does anything to truly stand out in a positive way and it has some real issues. From its somewhat questionable Build Quality to its very good voltage regulation, to its terrible Transient Load results, to its average DC Output Quality and noise output the GIGABYTE P750GM is the very definition of a mixed bag. That is, of course, before we get to the fact that its efficiency was a bit low for an 80 Plus Gold unit and it was outside the claimed 80 Plus parameters in those tests. Yeah. So, what is this mixed bag of a unit going to cost us?

Today, we find that the GIGABYTE P750GM is currently harder to come by, like all units, and the best price we can find is $119.99 at Amazon. Now, that is a bit lower price than what we have seen from some other 750W units during the pandemic-induced price spikes. However, it seems that this unit definitely needs this lower price point to make it attractive given how it performs relative to those other units.

Users looking for what might be the best 750W unit on the market will definitely want to look elsewhere. However, if you are in a pinch and you need a serviceable 750W power supply at a good price (which is important in today’s crazy pricing) then the GIGABYTE P750GM might make sense at the right price point.

Discussion

Paul Johnson

Paul is a long time PC hobbyist and tech enthusiast having gotten his start when he broke his first C64 quickly followed by breaking his first IBM XT. Most notably however, for 12 years, he served as the...

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4 Comments

  1. There’s something therapeutic with reading through a Paul Johnson PSU review – it’s like comfort food for the PC DIY-soul.
  2. Great review Paul. I’ve been reading some good, but mostly bad user reviews about Gigabyte PSU’s. This review is way more clear if someone was considering one of these units.
  3. Great review Paul. I’ve been reading some good, but mostly bad user reviews about Gigabyte PSU’s. This review is way more clear if someone was considering one of these units.

    No doubt you have. They are probably right as well. We definitely didn’t have the best results with this unit and there are known issues with them that we got lucky and did not hit to a degree.

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