A pair of Gigabyte power supplies seem prone to catastrophic failure
Several reports suggest that Gigabyte’s GP-P750GM and GP-P850GM power supplies may pose a high risk of malfunction or serious failure. In some cases, these power supplies even came out with a literal bang.
The issue was first noted by famous PSU reviewer Aristeidis Bitziopoulos in his TechPowerUp review at the end of 2020. In this review, he concludes that “Unlike the Aorus PSU range, which was surprisingly good, this one is a great one. disappointment…. starters, my sample died during the overkill evaluation, which is a real shame. Primary switching FETs exploded with a bang. “
He also explains the problem in more detail in this Hardware Busters video.
An exploding power supply is about as bad as it gets. However, the sample size is also as small as it could be here, so more testing is needed to draw a firm conclusion.
With this in mind, Bitzopoulos tested two more 850 W samples. Both performed as they should without error. He also told me that he had made inquiries with distributors and found that, at least in Europe, these models did not have unusually high RMA rates.
From there, it would be easy to assume that the 850W model is a little less prone to giving up the ghost (which may be true) and that the 750W model may have been a bad sample. However, this is far from the end of this story.
For one thing, there are other quirks or points of concern with the Gigabyte GP-P750-GM that Bitzopoulos describes in his review. These include high OPP protection threshold, poor quality FETs, unknown caps, short EPS cable, and poorly advertised fan.
But it’s still far from exploding. Rather, it is a more in-depth investigation from another source that seems more troubling.
Following further reports from viewers regarding the failure rates of the Gigabyte GP-P750GM and GP-P850GM power supplies, Gamers Nexus has also investigated the issue. He reports that 5 of the 10 units tested failed “in explosive capacity”, an example of which you can clearly see in his video. The surviving power supplies passed the tests without a problem, which also included a power supply in an endurance test for an entire month.
It is clear that not all GP-P750GM and GP-P850GM units are immediately defective, but those that do could have dire consequences.
Gamers Nexus says the power supply issue it encountered could stem from an issue with OCP, OTP, or OPP. These are circuits responsible for shutting down the power supply when certain values are greater than what the power supply is designed to handle, such as high current or high temperature. According to his tests, these power supplies are able to run at a high value before shutting down in this way and in some cases exceeding those limits before shutting down.
Bitzopoulos tells me he thinks the problem ultimately comes down to poor design.
“I strongly believe that this is just a bad design, that the FETs are not being driven properly and although under quick pre-checks and normal conditions the power supply may work, there are cases (not just under duress) they fail. The timing of the FETs is not correct and this is due to a bad gate driver or bad implementation. “
He also says that this is probably a fairly easy fix once identified, and expects the OEM producing this power supply for Gigabyte, MEIC, to perform a silent fix to resolve the issue, if he hasn’t already.
This still leaves the existing GP-P750GM and GP-P850GM power supplies, which appear to be prone to higher than standard failure rates, in general. These power supplies were also shipped with graphics cards as part of the Newegg Shuffle bundles, which could make them a number currently in use with the latest silicon GPUs.
Gigabyte is at least aware of the issue, although we have yet to hear of a further investigation from it. Bitzopoulos informed an R&D supervisor after the tests, who told him that of the five samples Gigabyte tested, all five passed the OPP tests. And that seems to have been the end of it.
We will need confirmation from Gigabyte to be sure of the extent of this issue, so I have requested an official response and will update this article if I hear back.
For now, my advice to those who have installed this PSU would be to replace it with another. It’s not an ideal solution, but it’s just not worth losing your graphics card or other components to a faulty power supply, especially since the kit is so valuable and that the prices are so high.