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PSU Expert Aris Mpitziopoulos Responds to Gigabyte Statement on GP-P750/850 GM Design Flaws

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Cybenetics certification program's chief engineer, a renowned expert with switching power supplies, and TechPowerUp contributor, Dr Aris Mpitziopoulos, released detailed commentary on the recent statement released by GIGABYTE on the GP-P750/850 GM series PSU design flaw reportage in the press. The earliest of this was broken on TechPowerUp, with our December 2020 review of the GP-P750GM, which led with the headline "With an Explosive Attitude."

Mpitziopoulos dives into the technical details of the design flaw being not just a badly programmed Over-Power Protection (OPP) safety mechanism, but a flawed hardware design overall. Since he reviewed PSUs from this series for TechPowerUp and Hardware Busters, he shares his perspective on how the reviews went, more importantly, the back-and-forth with GIGABYTE when the flaws were discovered.



The following is a statement by Aris Mpitziopoulos:

I didn't want to bother with this matter again initially, but something was troubling me. It can't be right, Gigabyte blaming us reviewers, or users, for abusing its power supplies and not its engineer. So after some thought, I decided to reply to their statement issued on 13th August 2021 about the GP-P750/850 GM PSUs. Below you will find Gigabyte's allegations, as they are written in its statement and my responses.

GIGABYTE: takes reports of this manner extremely seriously and therefore would like to address the reported potential issues as follows…

Aris response: I reported the issues I faced with the GP-P750GM power supply in late October 2020, before I post its review on TechPowerUp and the video review on the Hardware Busters YT channel, and GIGABYTE responded that its engineers tested five units and found no problems. They didn't ask for my bad sample back for failure analysis, which is the typical procedure, and they didn't offer a second sample to continue the review. I have kept all of my correspondence with GIGABYTE's respective team, in case there is any doubt.

GIGABYTE: The OPP safety feature is designed to shut down the unit when the power load exceeds the wattage the unit was designed to operate within. The OPP was set to 120% to 150%, 1020 W~1300 W for GP-P850GM, and 900 W~1125 W for the GP-P750GM.

Aris response: OPP is to protect the PSU from failures. That said, GIGABYTE's engineers should have configured it accordingly. Some platforms with top-notch and tolerant to stress components can have higher OPP settings than other lower-end platforms. It is up to the manufacturer to correctly set OPP to effectively protect the power supply under all conditions and the system that the PSU feeds with power. Lastly, OPP with a 30% range is too high. GIGABYTE should ask for a lower range.

GIGABYTE: We were made aware by third parties of concerns regarding potential issues of the GP-P850GM and GP-P750GM tripping at high wattages when tested via DC Electronic Load equipment for extended lengths of time repeatedly close to the 120% to 150% OPP trigger point. This level of extended testing could severely reduce the lifespan of the product and components of the GP-P850GM and GP-P750GM.

Aris response: First of all, there was no prolonged testing period under overloads since most samples died within a few minutes of testing as Steve (Gamer Nexus) mentions in his video. In my case, the GP-P750 GM sample that I tested shut down during a short period of OPP evaluation and exploded once I tried to start it again to continue testing, with no load on its rails. Even if extended testing at high loads was the case, the engineers should use lower OPP triggering points from the moment they are well aware that the platform can handle higher than normal loads. Finally, reducing the lifespan is an entirely different story from exploding parts, which clearly shows a problem with the OPP setting, which GIGABYTE believes is the culprit.

GIGABYTE: GIGABYTE has made adjustments and lowered the OPP on GP-P850GM and GP-P750GM…. from 120% ~ 150% to 110% ~ 120%

Aris response: GIGABYTE noticed, after our findings, that the platforms cannot withstand a 120%-150% OPP rating and decided to lower it. The problem is that 110%-120% OPP is impossible with analog controllers, which use resistors to adjust OPP. These resistors drift with temperature. In other words, their resistance changes according to the operating conditions, so it is impossible to achieve such a small OPP range under both cold and hot conditions. The only way to achieve a tightly set OPP is through digital circuits, an MCU. Finally, GIGABYTE doesn't mention the operating conditions under which the new OPP settings apply.

GIGABYTE: GIGABYTE would like to stress the potential issues that were reported, only seemed to occur after very long time periods of extreme load testing via DC Electronic load equipment and would not be typical of any real world usage.

Aris response: Gamer Nexus' samples died in a matter of minutes, and my sample died after a short period of OPP evaluation. Moreover, a quick look at the user reports (Newegg, forums, etc.) shows that most of these PSUs died under normal conditions. With so many failures reported on Newegg reviews, it cannot just be a coincidence.

GIGABYTE: GIGABYTE GP-P850GM and GP-P750GM PSU's included industry standard power protection designs OCP, OTP, OVP, OPP, UVP, and SCP.
Safety certification from various countries to ensure safe and stable operation of your system.

Aris response: From the moment these units have a CE certification, I would love to check the corresponding CE reports including protection features evaluation. To the best of my knowledge, no safety certification evaluates the PSU's protection features.

GIGABYTE: Despite the fact that both before & after OPP adjustment versions are reliable for real world usage

Aris response: Many users that bought these products have a different opinion and experience. Also, OPP is not there for us reviewers only, but it should protect the PSU under all conditions. Otherwise, there is no point in having this protection feature when it doesn't save the PSU. And also, who and what defines real-world usage? For me, typical use can be having my PC idle most of the time while other users play games most of the time, stressing the entire system. Other users can run tests with Furmark and Prime95 at the same time. My point is, real-world usage varies from user to user.

GIGABYTE: Serial Number below can apply for Return and Exchange service

Aris response: GIGABYTE had made OPP changes to some production batches but didn't inform the people that bought units with high OPP about this or even give them the chance to replace their units, just to be on the safe side. They applied a silent fix, and this means that they were troubled enough to do it.

Conclusion: This is not just a badly set OPP since many units died under moderate loads and within short periods. I strongly believe that this is just a bad design, the FETs are not driven correctly, and although in quick pre-checks and normal conditions, the PSU can be ok, there are cases (not only under stress) where they fail. The timing of the FETs is not correct, and this is due to a lousy gate driver or a lousy implementation. Of course, I cannot be dead sure without any samples, older and newer generations, in my hands to test and break apart for failure analysis.

This article explains the problem I described above in detail.



View at TechPowerUp Main Site
 
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GIGABYTE: GIGABYTE GP-P850GM and GP-P750GM PSU's included industry standard power protection designs OCP, OTP, OVP, OPP, UVP, and SCP.
Safety certification from various countries to ensure safe and stable operation of your system.

Aris response: From the moment these units have a CE certification, I would love to check the corresponding CE reports including protection features evaluation. To the best of my knowledge, no safety certification evaluates the PSU's protection features.
scary huh folks! i am so glad to see aris address that myth!

don't assume that because you see a label with some alphabet (IEEEC/CE ) that it's magically safer. sorry but i have argued this for years now.
 
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While every company will try and defend their product, after this long and so many reviewers and consumers reporting the same issue, it is unbelievable that Gigabyte adamantly deny issues with their PSU. Instead of doing the right thing of stopping sale and recalling these dangerous products, they want to continue to sell it with some software fix. Just goes to show how tone deaf and irresponsible they are. I think I am done with Gigabyte products now. If their engineers can’t figure out something wrong with their product, I am not confident they can figure out anything wrong with their other products too.
 
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What an awful response to this issue. I have owned good products produced by gigabyte and thought they were a more reputable company. They need to recall these units and replace them. Had they immediately done that, it would show the company is dedicated to creating safe and reliable hardware. Based on their response to this issue, I will be avoiding their products going forward. I suspect this is going to cost them far more in lost sales than they would have lost with a recall, and they should absolutely be held liable for any damages, injuries, or deaths caused by these apparently explosive psus.
 
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Until a government or class action lawsuit comes along, Gigabyte knows they don't have to have accountability.
 
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I would stay away from this psu, can also fry your video card and anything else, reason i always buy top tier 1 psu's, pay more and sure can sleep in peace, better be safe than sorry. Where I live there are tons for sale, poor people who will buy them, there is no warranty where I live for psus, so you buy and you lose the money and other things together.
 
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Until a government or class action lawsuit comes along, Gigabyte knows they don't have to have accountability.
Unfortunately, they will just do the minimal of recalling or compensating users from whichever state/ country that sue and won the case. There are many countries with weak consumer law where they will get away scot free.
 
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scary huh folks! i am so glad to see aris address that myth!

don't assume that because you see a label with some alphabet (IEEEC/CE ) that it's magically safer. sorry but i have argued this for years now.
To be honest, it means it's safer. Safer as in "will not kill you immediately when you touch it" but certainly not "poor design built to a price by child labor in China so it might fail at a random point in time damaging other hardware and the manufacturer will blame it on you".
 
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What an awful response to this issue. I have owned good products produced by gigabyte and thought they were a more reputable company. They need to recall these units and replace them. Had they immediately done that, it would show the company is dedicated to creating safe and reliable hardware. Based on their response to this issue, I will be avoiding their products going forward. I suspect this is going to cost them far more in lost sales than they would have lost with a recall, and they should absolutely be held liable for any damages, injuries, or deaths caused by these apparently explosive psus.
The response is in my opinion, unacceptable and irresponsible. I've been a user of Gigabyte motherboards over the last 2 decades or more, and after this incident, I am going to stop using their products. Besides the fact that Gigabyte was one of those manufacturers that aggressively increased pricing of their GPUs since the start of the year, this PSU issue is the final straw. The fact they are forcing people to buy this PSU along with a GPU just shows that they are aware of some issues with it and trying to dispose of the product by dirty means.
 
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To be honest, it means it's safer. Safer as in "will not kill you immediately when you touch it" but certainly not "poor design built to a price by child labor in China so it might fail at a random point in time damaging other hardware and the manufacturer will blame it on you".
to be honest, you're arguing semantics and using a horrible hyperbole. the point is PSUs do not get tested as many people assume. this is one of the reasons is why reputable reviews/reviewers are necessary.

as the old saying goes, you can lead a horse to water but you can't make him drink it.
 
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GigaFail at it again...
 
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The issue here is that gigabyte charged an arm and a leg for these psu's, I mean charging 150 usd 850w and for that money you can buy an evga g2 or g3 850 or even a 1000w, it's insane, a lot of money for a very bad dangerous product.
 
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I didn't want to bother with this matter again initially, but something was troubling me. It can't be right, Gigabyte blaming us reviewers, or users, for abusing its power supplies and not its engineer. So after some thought, I decided to reply to their statement issued on 13th August 2021 about the GP-P750/850 GM PSUs. Below you will find Gigabyte's allegations, as they are written in its statement and my responses.
Total rubbish response from Gigabyte. Given that reviewers and user all over the world are experiencing the same problems AND those problems are NOT happening with PSUs of other makers, this can only be a d-bag move from a total wet willy at Gigabyte HQ.

Gigabyte could have owned the problem and worked to make it right. However, this pathetic, shameful reaction destroys trust and brand faith which was already less-than-great.

@ GigaByte
What the actual hell are you thinking?!? Get your damned act together, get your head out of your collective bums and make this situation right with people before you get returned to bottom tier status!
 
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scary huh folks! i am so glad to see aris address that myth!

don't assume that because you see a label with some alphabet (IEEEC/CE ) that it's magically safer. sorry but i have argued this for years now.
CE just means you won't get a shock when you plug it in. UL is a bit more thorough, but still wouldn't test the protection features.

While every company will try and defend their product, after this long and so many reviewers and consumers reporting the same issue, it is unbelievable that Gigabyte adamantly deny issues with their PSU. Instead of doing the right thing of stopping sale and recalling these dangerous products, they want to continue to sell it with some software fix. Just goes to show how tone deaf and irresponsible they are. I think I am done with Gigabyte products now. If their engineers can’t figure out something wrong with their product, I am not confident they can figure out anything wrong with their other products too.
You clearly didn't read the article, it's not a software fix, as it can't be done on these PSUs.

The response is in my opinion, unacceptable and irresponsible. I've been a user of Gigabyte motherboards over the last 2 decades or more, and after this incident, I am going to stop using their products. Besides the fact that Gigabyte was one of those manufacturers that aggressively increased pricing of their GPUs since the start of the year, this PSU issue is the final straw. The fact they are forcing people to buy this PSU along with a GPU just shows that they are aware of some issues with it and trying to dispose of the product by dirty means.
It was Newegg that forced people to do that, not Gigabyte.
 
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It was Newegg that forced people to that, not Gigabyte.
Yes but.... Newegg was forced to buy gpus as a bundle from gigabyte...they are just passing along the pain to the user. Still quite culpable.
 
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Yes but.... Newegg was forced to buy gpus as a bundle from gigabyte...they are just passing along the pain to the user. Still quite culpable.
And you know this how?
As far as what I saw, the Gigabyte PSU was sold with other brands of graphics cards as a bundle as well, not just Gigabyte cards.
 
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And you know this how?
As far as what I saw, the Gigabyte PSU was sold with other brands of graphics cards as a bundle as well, not just Gigabyte cards.
GN or one of the other reviewers covered it months ago. GPU makers are using high demand of gpus to get rid of garbage products.
These psus are everywhere, newegg happens to be the one making the worst bundles trying to push it onto consumers.
Microcenter has shelves of these trash psu's but aren't forcing bundles.
 
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GN or one of the other reviewers covered it months ago. GPU makers are using high demand of gpus to get rid of garbage products.
These psus are everywhere, newegg happens to be the one making the worst bundles trying to push it onto consumers.
Microcenter has shelves of these trash psu's but aren't forcing bundles.
So in other words, it's Newegg, not Gigabyte pushing the bundles.

Yes, it's a crap PSU, but Gigabyte clearly didn't force these bundles based on your own answer here, as if that was the case, then all retailers would be selling the same bundles.
 
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I would stay away from this psu, can also fry your video card and anything else, reason i always buy top tier 1 psu's, pay more and sure can sleep in peace, better be safe than sorry. Where I live there are tons for sale, poor people who will buy them, there is no warranty where I live for psus, so you buy and you lose the money and other things together.

to be honest I have stayed away from gigabyte products for a long time, I always felt their quality was sub par.
 
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So in other words, it's Newegg, not Gigabyte pushing the bundles.

Yes, it's a crap PSU, but Gigabyte clearly didn't force these bundles based on your own answer here, as if that was the case, then all retailers would be selling the same bundles.
You can choose to ignore the reality of GPU vendors forcing unwanted gear on retailers. Microcenter gpu prices are a tad higher to compensate not forcing the bundles.
I think microcenter having them on shelves is a horrible thing given they are bombs waiting to go off. Newegg is just worse by forwarding the bundle forced on them.
 
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don't assume that because you see a label with some alphabet (IEEEC/CE ) that it's magically safer. sorry but i have argued this for years now.

CE just means you won't get a shock when you plug it in. UL is a bit more thorough, but still wouldn't test the protection features.
CE is funny. It's "self declaration". If someone reports you, they just ask you to remove the logo. That's why so many cheap PSUs have CE. FCC is the same way.

The GP--GM series PSU label has UL (which is not required), CCC, TÜV, KCC (which are required in those regions).

Patrick noted that different samples have different parts used for the primary PWM switchers.

I have to wonder if the decision was made to use multiple sources was made initially, or because so many suppliers simply have no parts (I can't get an Infineon MOSFET for an HX's PWM circuit to save my life right now!). If you second and third source after you've already labeled and launched the product, you have to provide samples, pay and wait each time you do so. Thousands of dollars and several weeks. Part of me wonders if the logos on the label even actually represent the product shipping.
 
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to be honest, you're arguing semantics and using a horrible hyperbole. the point is PSUs do not get tested as many people assume. this is one of the reasons is why reputable reviews/reviewers are necessary.

as the old saying goes, you can lead a horse to water but you can't make him drink it.
It was an, apparently failed, attempt at sarcasm. Furthermore, I'd like to make a point that no consumer hardware is tested to the extent consumers assume it is. Typically certification testing is more along the lines of "does it cause immediate harm? Does it spew out enough interference to affect other devices? Can it handle some interference itself?". Certification is not really about functional characteristics of the device, just basic safety. I assumed it's common knowledge.
 
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So in other words, it's Newegg, not Gigabyte pushing the bundles.

Yes, it's a crap PSU, but Gigabyte clearly didn't force these bundles based on your own answer here, as if that was the case, then all retailers would be selling the same bundles.

You can choose to ignore the reality of GPU vendors forcing unwanted gear on retailers. Microcenter gpu prices are a tad higher to compensate not forcing the bundles.
I think microcenter having them on shelves is a horrible thing given they are bombs waiting to go off. Newegg is just worse by forwarding the bundle forced on them.

I think there's a misunderstanding.

Gigabyte, EVGA and probably other GPU vendors that also happen to have PSUs are doing the same thing. They're telling retailers that they can have graphics cards if they also buy PSUs. In some cases it's one to one. The PSUs are often heavily discounted too as they apply Nvidia MDF to the cost of the PSU. Since there's desperation in getting graphics cards, many vendors are taking on excessive PSU inventory to maintain their level of GPU stock.

This isn't an uncommon practice. This is why you'll see a lot of SIs using the same brand GPU and PSU. When I worked for BFG, we played this game too. If Best Buy wanted BFG graphics cards, they'd have to also stock BFG power supplies exclusively. Once BFG lost got screwed over by Nvidia when they started selling it's own branded reference cards directly to Best Buy, Best Buy stopped buying BFG cards, and therefore PSUs. The end result was, of course, BFG went out of business because Best Buy was more than 60% of their sales.

It was an, apparently failed, attempt at sarcasm. Furthermore, I'd like to make a point that no consumer hardware is tested to the extent consumers assume it is. Typically certification testing is more along the lines of "does it cause immediate harm? Does it spew out enough interference to affect other devices? Can it handle some interference itself?". Certification is not really about functional characteristics of the device, just basic safety. I assumed it's common knowledge.
IEC-62368-1 (the most current standard) ensures that a PSU is "safe" to the user. Unfortunately, testing to this is not required.... until you get busted and almost (or do) kill someone.
 

eidairaman1

The Exiled Airman
Joined
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Processor AMD FX 8350@ 5.0GHz
Motherboard Asus TUF 990FX Sabertooth R2 2901 Bios
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Keyboard Roccat Ryos MK Pro
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So the ga parts are dumpster fires. Proves they are trash, haven't been good since AM3 either.
 
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