https://www.reddit.com/r/nvidia/comments/ydogwe/it_seems_some_4090_owners_are_unaware_psu/

5 hours ago, Ianrivaldosmith said:

I assume this would be better then? :-

"A good example of a functioning connection are, for example, the two 12VHPWR cables of the new be quiet! Dark Power Pro 13, which I still show here as an example. Because there you don’t have to do the balancing act with the voltage bridges, but spend each pin its own 16AWG line. Sure, 12 thick wires in one cable is not that sexy now either, but it is at least an accurate and clean solution."

------------------------------

beQuiet

6 hours ago, Ianrivaldosmith said:

I assume this would be better then? :-

https://www.awd-it.co.uk/components/power-supplies/corsair-psu/corsair-600w-pcie-5-0-12vhpwr-type-4-psu-power-cable-cp-8920284.html?gclid=CjwKCAjw2OiaBhBSEiwAh2ZSPwKZflgYhhOBdR5_VC_V82dv0evj3uZgO00R8u-bakiwRW2HuiOL7RoChuYQAvD_BwE

Yes, that's the one I'll be using 🙂

The cablemod 90 degree option seems like a good choice (it's fairly pricey though) when it is launched Oct 31st. 

I did consider ordering a cablemod 12-pin to 3x8-pin for my Corsair RMx (2021) power supply. Currently I use the 12-pin to 3x8-pin included with the MSI 4090 and 3x cablemod 8-pin PCI-e Extensions. 

There's a reddit discussion on power cables for the 4090s with some useful info. 

I also briefly looked into the new ATX3.0 PSUs with native 16 pin PCIe 5.0 connectors at both ends (PSU+GPU). I haven't found compelling enough arguments though for upgrading. Anyone planning on upgrading their PSU to ATX3.0?

Edited October 27, 20223 yr by Cpt_Piett

9 minutes ago, SierraDelta said:

Yes, that's the one I'll be using 🙂

Yup I just ordered one now 

Jayz is working hard these days to get to the bottom of these power cable issues: 

https://www.igorslab.de/en/adapter-of-the-gray-analyzed-nvidias-brand-hot-12vhpwr-adapter-with-built-in-breakpoint/

Quote

Those who are now beating up on the new 12VHPWR (although I don’t really like the part either) may generate nice traffic with it, but they simply haven’t recognized the actual problem with the supposedly fire-hazardous and melting connections or cables. Even if certain YouTube celebrities are of a different opinion because they seem to have found a willing object of hate in the 12VHPWR once again: This connection is actually quite safe, even if there are understandable concerns regarding the handling.

However, the “safe” is only valid if e.g. the used supply lines from the power supply with “native” 12VHPWR connector have a good quality and 16AWG lines or at least the used 12VHPWR to 4x 6+2 pin adapter also offers what it promises. Which brings us directly to the real cause of the cases that occurred: It’s the adapter solution exclusively provided by NVIDIA to all board partners, which has fire-dangerous flaws in its inner construction!

...

The overall build quality of the included adapter for the GeForce RTX 4090, which is distributed by NVIDIA itself, is extremely poor and the internal construction should never have been approved like this. NVIDIA has to take its own supplier to task here, and replacing the adapters in circulation would actually be the least they could do.

 

It is starting to look like the actual issue is solely and entirely with the design and implementation of the Nvidia supplied "4 into 1" style adapter cable. 

Basically the Nvidia adapter cable converts the incoming 4 wires into the needed 6 wires by soldering to a thin sheet metal bus plate that is easily broken under flexing.

Adapter cables from OEM manufactures are apparently fine.

 

 

It also seems like the Nvidia connector is not distributing the current from the 4 PCIe connectors evenly across the 6 pins... the two outside pins are getting a lot more current compared to the 4 inside pins.  

7 minutes ago, Glenn Fitzpatrick said:

It is starting to look like the actual issue is solely and entirely with the design and implementation of the Nvidia supplied "4 into 1" style adapter cable. 

I was hoping you would comment on this Glenn as you seem knowledgeable on the subject. A lot of this electrical stuff is above my head. 

6 hours ago, Cpt_Piett said:

The cablemod 90 degree option seems like a good choice (it's fairly pricey though) when it is launched Oct 31st. 

I did consider ordering a cablemod 12-pin to 3x8-pin for my Corsair RMx (2021) power supply. Currently I use the 12-pin to 3x8-pin included with the MSI 4090 and 3x cablemod 8-pin PCI-e Extensions. 

There's a reddit discussion on power cables for the 4090s with some useful info. 

I also briefly looked into the new ATX3.0 PSUs with native 16 pin PCIe 5.0 connectors at both ends (PSU+GPU). I haven't found compelling enough arguments though for upgrading. Anyone planning on upgrading their PSU to ATX3.0?

When you look at what needs to be done with any kind of adapter, you realize the issue...

 

Any adapter needs to take 12 pins of power down to 6 (and 16 to 6 on the ground side).  And the size of that 12 pin connector doesn't really allow proper splicing to be done there as Nvidia's cable shows. I'm not sure how other adapter cables are doing it, but I would only consider a cable that is splicing 12 to 6 before the connector.  Otherwise 12 to 12 straight out of the Power Supply is the best.

Edited October 28, 20223 yr by Virtual-Chris

15 minutes ago, Virtual-Chris said:

Otherwise 12 to 12 straight out of the Power Supply is the best.

Yeah I'm considering that option down the line. Not many ATX 3.0 PSUs in stock yet though. Hopefully my cables have not already melted by then. At the moment I'm happy the adapter cable is going straight down from my GPU without any tension on it at all. 

Edited October 28, 20223 yr by Cpt_Piett

23 minutes ago, Virtual-Chris said:

It also seems like the Nvidia connector is not distributing the current from the 4 PCIe connectors evenly across the 6 pins... the two outside pins are getting a lot more current compared to the 4 inside pins.  

Yeah, some people seem to be assuming the problem is greater on the outside pins as they are more susceptible to flexing damage.

However it is also quite possible the current density on the end connectors of a simple straight bus is higher - no idea that sort of stuff is beyond my paygrade 😄

Paul has also investigated this. Link with time stamp from his conclusion:

It’ll be interesting to see nVidia’s response to the adapter issues. Will they send out replacements?

2 hours ago, Cpt_Piett said:

Yeah I'm considering that option down the line. Not many ATX 3.0 PSUs in stock yet though. Hopefully my cables have not already melted by then. At the moment I'm happy the adapter cable is going straight down from my GPU without any tension on it at all. 

Would you say in a few months time, it's safe to say the ATX 3.0 PSU's will ship with either the proper cabling or well-built adapters to eliminate this situation?

And as for your cable, your thinking is that without any tension on it, you're reducing the chance of arcing etc.?   I still would want to replace that adapter asap

2 minutes ago, Mace said:

Would you say in a few months time, it's safe to say the ATX 3.0 PSU's will ship with either the proper cabling or well-built adapters to eliminate this situation?

 

I just ordered a ATX 3.0 PSU. Perhaps I would have been fine, just don’t want to take any chances. 

I don’t think there’s any tension on my adapter as it’s basically hanging straight down from the GPU. But with a new PSU I’ll get a cable with 12-pin in both ends.