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PSA: Don't Just Arm-wrestle with 16-pin 12VHPWR for Cable-Management, It Will Burn Up

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Despite sticking with PCI-Express Gen 4 as its host interface, the NVIDIA GeForce RTX 4090 "Ada" graphics card standardizes the new 12+4 pin ATX 12VHPWR power connector, even across custom-designs by NVIDIA's add-in card (AIC) partners. This tiny connector is capable of delivering 600 W of power continuously, and briefly take 200% excursions (spikes). Normally, it should make your life easier as it condenses multiple 8-pin PCIe power connectors into one neat little connector; but in reality the connector is proving to be quite impractical. For starters, most custom RTX 4090 graphics cards have their PCBs being only two-thirds of the actual card length, which puts the power connector closer to the middle of the graphics card, making it aesthetically unappealing, but then there's a bigger problem, as uncovered by Buildzoid of Actually Hardcore Overclocking, an expert with PC hardware power-delivery designs.

CableMod, a company that specializes in custom modular-PSU cables targeting the case-modding community and PC enthusiasts, has designed a custom 12VHPWR cable that plugs into multiple 12 V output points on a modular PSU, converting them to a 16-pin 12VHPWR. It comes with a pretty exhaustive set of dos and don'ts; the latter are more relevant: apparently, you should not try to arm-wrestle with an 12VHPWR connector: do not attempt to bend the cable horizontally or vertically close to the connector, but leave a distance of at least 3.5 cm (1.37-inch). This ensures reduced pressure on the contacts in the connector. Combine this with the already tall RTX 4090 graphics cards, and you have yourself a power connector that's impractical for most standard-width mid-tower cases (chassis), with no room for cable-management. Attempting to "wrestle" with the connector, and somehow bending it to your desired shape, will cause improper contacts, which pose a fire-hazard.



Update Oct 26th: There are multiple updates to the story.

The 12VHPWR connector is a new standard, which means most PSUs in the market lack it, much in the same way as PSUs some 17 years ago lacked PCIe power connectors; and graphics cards included 4-pin Molex-to-PCIe adapters. NVIDIA probably figured out early on when implementing this connector that it cannot rely on adapters by AICs or PSU vendors to perform reliably (i.e. not cause problems with their graphics cards, resulting in a flood of RMAs); and so took it upon itself to design an adapter that converts 8-pin PCIe connectors to a 12VHPWR, which all AICs are required to include with their custom-design RTX 4090 cards. This adapter is rightfully overengineered by NVIDIA to be as reliable as possible, and NVIDIA even includes a rather short service-span of 30 connections and disconnections; before the contacts of the adapter begin to wear out and become unreliable. The only problem with NVIDIA's adapter is that it is ugly, and ruins the aesthetics of the otherwise brilliant RTX 4090 custom designs; which means a market is created for custom adapters.

Update 15:59 UTC: A user on Reddit who goes by "reggie_gakil" posted pictures of a GeForce RTX 4090 graphics card with with a burnt out 12VHPWR. While the card itself is "fine" (functional); the NVIDIA-designed adapter that converts 4x 8-pin PCIe to 12VHPWR, has a few melted pins that are probably caused due to improper contact, causing them to overheat or short. "I don't know how it happened but it smelled badly and I saw smoke. Definetly the Adapter who had Problems as card still seems to work," goes the caption with these images.

Update Oct 26th: Aris Mpitziopoulos, our associate PSU reviewer and editor of Hardware Busters, did an in-depth video presentation on the issue, where he details how the 12VHPWR design may not be at fault, but extreme abuse by end-users attempting to cable-manage their builds. Mpitziopoulos details the durability of the connector in its normal straight form, versus when tightly bent. You can catch the presentation on YouTube here.

Update Oct 26th: In related news, AMD confirmed that none of its upcoming Radeon RX 7000 series RDNA3 graphics cards features the 12VHPWR connector, and that the company will stick to 8-pin PCIe connectors.

Update Oct 30th: Jon Gerow, aka Jonny Guru, has posted a write-up about the 12VHPWR connector on his website. It's an interesting read with great technical info.

View at TechPowerUp Main Site | Source
 
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what a horrible design... hoping amd is competitive this time.
 
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That's alright, if they burn up their card, they're rich, they can just buy another...
 
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One must learn the hard way I guess...
When "how it look" is all that matter, blended with low common sense and without minimal 'RTFM ability'- you'll get burned.
 
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Well

I am NOT surprised
 
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what a horrible design... hoping amd is competitive this time.
AMD will need to fallow this power standard design if they want to stay competitive in the high-end.
 
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nvidia should stop all the proprietary bullshit cables.

a few 6 or 8 pin is perfect nobody wants an electronic octopus hanging off a gpu.
 

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This adapter is rightfully overengineered by NVIDIA to be as reliable as possible, and NVIDIA even includes a rather short service-span of 30 connections and disconnections; before the contacts of the adapter begin to wear out and become unreliable.

This is the same industry-standard cycle as for many molex connectors. i.e., not an issue for the normal end-user.

molex.png


Scare-mongering (or lack of due-diligence) isn't helpful when trying to remain a reliable tech site.
 
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AMD will need to fallow this power standard design if they want to stay competitive in the high-end.

They don't need to stick the 2" connector at 90 degrees on a 5 inch wide card tho.
 
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They don't need to stick the 2" connector at 90 degrees on a 5 inch wide card tho.
Yep. 4090`s are with very bad, biffy design that will make you replace your case in order to fit them properly.
A simple L-shape 12VHPWR adaptor will solve many problem but than again- more adapters...
 
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or maybe just use 4 8Pin connectors, instead of 2, is they gonna pull out a 600Watt GPU. I dont believe, that making few more 8pin connectors gonna make life harder, than this new nvidia one.
Why not make 2 of the new connectors, seems to me 600w on one cable is a bit too much heat wise, we need 4 8Pin connectors to get the same power.
 
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or maybe just use 4 8Pin connectors, instead of 2, is they gonna pull out a 600Watt GPU. I dont believe, that making few more 8pin connectors gonna make life harder, than this new nvidia one.
This is not NV idea, it`s a new general standard.
4*8pin is not better, I think it`s even worse.
Using the 12VHPWR to 4*8pin adapter makes life harder.
AMD need to also adopt the 12VHPWR but to better position it on the GPU.

Why not make 2 of the new connectors, seems to me 600w on one cable is a bit too much heat wise, we need 4 8Pin connectors to get the same power.
Because when you need 2*12VHPWR to feed next gen GPU`s that's 4*whatever you suggested.
The heat is not the problem here, the bending force on the connector is.
 
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This is not NV idea, it`s a new general standard.
4*8pin is not better, I think it`s even worse.
Using the 12VHPWR to 4*8pin adapter makes life harder.
AMD need to also adopt the 12VHPWR but to better position it on the GPU.


Because when you need 2*12VHPWR to feed next gen GPU`s that's 4*whatever you suggested.
The heat is not the problem here, the bending force on the connector is.
1. I have 3*8 pins in use and adding one more wouldn't be a problem even in the slightest.

2. You have one of these on hand and have tested this personally? Everything I'm seeing is a mixture of both. If you've tested this yourself, I'll certainly take your word under consideration.
 
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I think it`s even worse.
its not worse, 4x8pin has 2 times less load on a single pin, than 12VHPWR.
12VHPWR its not suited for 600W, its just a better version 2x8pins, where u move "unnecessary signals" to small pins, saving space by this (having 12 pins, instead of 16)
 
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its not worse, 4x8pin has 2 times less load on a single pin, than 12VHPWR.
12VHPWR its not suited for 600W, its just a better version 2x8pins, where u move "unnecessary signals" to small pins, saving space by this (having 12 pins, instead of 16)
According to who?
Because you have many number of examples that works without a problem and the tiny thing of a long validation process by electrical engineers.
You know, it can be smaller and better. CPU`s does that all the time.
 
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According to who?
Because you have many number of examples that works without a problem and the tiny thing of a long validation process by electrical engineers.
You know, it can be smaller and better. CPU`s does that all the time.
The 12vhpwr has less voltage pins man, the 8pins cable standard was overbuilt. You could literally power a 350w card with one single connector that splits off to 2x6+2pins.
 
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if you need to include this, its a bad design.

hell all they needed to do is add extra plastic at the end there (a sleeve if you will) so you cant bend it there so you are forced to bend it 35 mm away....
 
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This is the same industry-standard cycle as for many molex connectors. i.e., not an issue for the normal end-user.

View attachment 267011

Scare-mongering (or lack of due-diligence) isn't helpful when trying to remain a reliable tech site.
30 cycles over the course of 5~7 years of usage is not a whole lot, is it... and this is a connector that is not only thinner but also carries higher power.

And molex is certainly not known for its fantastic quality either. It looks and works like bottom barrel junk. Great comparison when we're talking about top end GPU power delivery :)

As always, cost considerations are clearly in play here and not to greater benefit of end user (safety) or product (longevity).
 
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Is anyone surprised?

Going from 24-Pin (3x 8-Pin) to 12-Pin with 50% smaller terminals delivering the same 450 Watt.

Now in a perfect world that may be fine, but the bending of the pins can't be avoided with the current design.
 
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Was there in the past any case where someone should be careful to not bend a cable? I think never. So, we can assume that we will have a big number of cases and maybe even see the 12VHPWR changing in the near future. Or maybe we will see cables that fix this problem. I have less than 2 euros USB cables with a metallic shield on them, I am pretty sure putting a metallic shield on a much more expensive cable like the 12VHPWR, is not really a cost problem.
1666683827445.png

I am reading on the internet people saying that this is a user error, but I believe it is not. There was never a case in the past where you have to be careful with a power cable, so how is this a user error? People never had to even consider something like this and even if the cables come with a warning on the installation manual, do even people know when the cable is bent more than it should? People are not engineers.
 
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So the cable needs 35mm space before bending.

... If 93% of all cases do not have the space for it, is it legal to include it?
 
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Wasn't this a collaborative effort between Intel and PCI-SIG?
yep, but the bashing contest is on.
It is anything but "proprietary"
 

the54thvoid

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30 cycles over the course of 5~7 years of usage is not a whole lot, is it... and this is a connector that is not only thinner but also carries higher power.

And molex is certainly not known for its fantastic quality either. It looks and works like bottom barrel junk. Great comparison when we're talking about top end GPU power delivery :)

As always, cost considerations are clearly in play here and not to greater benefit of end user (safety) or product (longevity).
Is there a higher standard than 30?

If so, what, and what specs? No point shooting something down without at least giving evidence the other way. Then at least I can change my stance and support yours. But without the evidence, your post sounds like mere opinion.

Not having a go at you, simply asking for something to see that will enable me to change my mind.
 
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