Gigabyte recently recalled some of its power supplies.Respond to Gigabyte’s statement Regarding the company’s explosive power supply, Dr. Aris Mpitziopoulos shared his insights into the reasons for the premature demise of GP-P850GM and GP-P750GM. Mpitziopoulos is a respected veteran in the industry and a power auditor for techy’s points.
When Mpitziopoulos evaluated the device last year, he had personally experienced the explosion of Gigabyte’s GP-P750GM power supply. Despite his efforts to share his findings with Gigabyte, the company claimed that it was unable to reproduce the problem, and the problem seemed to be covered up.
However, cumulative feedback from users of GP-P850GM and GP-P750GM showed that these devices were either defective right out of the box or had unexpected malfunctions. Please note that these seemingly ordinary users use their systems like you and me, not commenters who push the power to the maximum capacity.
It seems that GP-P850GM and GP-P750GM still have a tendency to explode when you least expect them. These units have a fire hazard and can at least kill other hardware in the system.
It can be said that the most prudent decision is to issue a complete product recall or replace the affected model with a product of the same capacity in the Aorus product line, which has proven to be very reliable equipment. Instead, Gigabyte offers voluntary recalls, and only when the power source comes from a certain batch.
Although Gigabyte believes that adjusting the OPP (over power protection) threshold is a solution to the problem, Mpitziopoulos said the problem lies in the overall design of these PSUs.
As part of the recall, Gigabyte issued a press release, and you can find Dr. Aris Mpitziopoulos’ response to the company’s communications below:
GBT: We attach great importance to reporting in this way, so we hope to solve the potential problems of the report as follows…
Aris reaction: I reported the problem I encountered when using the GP-P750GM power supply in late October 2020, and then released[ed] Its comments on TechPowerUp, a video comment on the points Busters YT channel, and GBT responded that its engineers tested five devices and found no problems. They did not ask to bring back my bad sample for failure analysis, which is a typical procedure, and they did not provide a second sample to continue the review. I keep all correspondence with GBT’s respective teams in case there are any doubts.
GBT: The OPP safety function is designed to shut down the device when the power load exceeds the wattage at which the device is designed to operate. OPP is set to 120% to 150%, GP-P850GM is 1020W~1300W, and GP-P750GM is 900W~1125W.
Aris reaction: OPP is to protect PSU from malfunction. In other words, GBT engineers should configure it accordingly. Some platforms with first-class and pressure-resistant components can have higher OPP settings than other low-end platforms. The manufacturer is responsible for the correct setting of OPP to effectively protect the power supply and the system powered by the PSU under all conditions. Finally, OPP with a 30% range is too high. GBT should require a lower range.
GBT: When a DC electronic load device was used to repeat a test that was close to 120% to 150% OPP triggered for a long time, we learned that third parties have concerns about the potential problems of GP-P850GM and GP-P750GM tripping at high wattage. This level of extended testing may severely shorten the service life of GP-P850GM and GP-P750GM products and components.
Aris reaction: First of all, the test time was not extended under overload conditions, because as Steve (the player’s Nexus) mentioned in his video, most samples died within a few minutes after the test. In my case, the GP-P750GM sample I tested shut down within a short time of OPP evaluation and exploded when I tried to start it again to continue the test, with no load on its rails. Even when performing extended testing under high load, engineers should use a lower OPP trigger point from the moment they know that the platform can handle higher than normal loads. Finally, reducing life is completely different from exploding parts, which clearly shows that there is a problem with the OPP setting, which GBT believes is the culprit.
GBT: Gigabyte has made adjustments on GP-P850GM and GP-P750GM to lower OPP… From 120% ~ 150% to 110% ~ 120%
Aris reaction: GBT noticed that according to our survey results, the platform cannot afford an OPP rating of 120%-150% and decided to lower it. The problem is that it is impossible for an analog controller to reach 110%-120% OPP, it uses resistors to adjust OPP. These resistances drift with temperature. In other words, their resistance will vary according to operating conditions, so it is impossible to achieve such a small OPP range under hot and cold conditions. The only way to achieve a tightly set OPP is through a digital circuit, that is, an MCU. Finally, GBT did not mention the operating conditions applicable to the new OPP settings.
GBT: Gigabyte would like to emphasize the reported potential problems, which seem to occur only after a long period of extreme load testing through DC electronic load equipment, and will not be any typical problems in actual use.
Aris reaction: Gamer’s Nexus sample expired within a few minutes, and my sample expired shortly after the OPP evaluation. In addition, a quick look at user reports (Newegg, forums, etc.) shows that most of these PSUs are dead under normal circumstances. It’s not just a coincidence that the Newegg review reports so many failures.
GBT: Gigabyte GP-P850GM and GP-P750GM PSU include industry standard power protection designs OCP, OTP, OVP, OPP, UVP and SCP.
National safety certification to ensure the safe and stable operation of your system.
Ali replied: From the moment these devices obtain the CE certification, I would like to check the corresponding CE report, including the protection function evaluation. As far as I know, there is no safety certification to evaluate the protection function of the PSU.
GBT: Although the OPP before and after adjustments are reliable for real-world use
Aris reaction : Many users who purchase these products have different views and experiences. In addition, OPP is not only for our reviewers, but it should protect the PSU under all conditions. Otherwise, when it does not save the PSU, it is meaningless to have this protection function. And, who and what defines the use in the real world? For me, the typical use might be to keep my PC idle most of the time, while other users spend most of the time playing games, which will put pressure on the entire system. Other users can use Furmark and Prime95 to run tests at the same time. My opinion is that actual usage varies from user to user.
GBT: The following serial numbers can apply for return and exchange services
Ali replied: GBT made OPP changes to some production batches, but did not notify the purchasers of high OPP units or even give them the opportunity to replace the units, just for safety reasons. They applied a silent fix, which means they have enough trouble to do it.
in conclusion: This is not just a bad OPP setting, because many units died under moderate load and within a short period of time. I firmly believe that this is just a bad design. The FET is not properly driven. Although the PSU can work properly under quick pre-checks and normal conditions, they will fail under certain conditions (not only under pressure). The timing of the FET is incorrect, this is due to poor gate driver or poor implementation. Of course, if there is no sample, whether it is the old generation or the new generation, I cannot be sure if I test and break it down for failure analysis in my hands.
This article Explained in detail the problem I described above.