NV 12VHPWR issues revisited

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MrTeal

Diamond Member
Dec 7, 2003
3,869
2,524
136
Quick testing in OCCT @ 600w with a ASUS 5090 Astral
AMP spread over the pins work as it should 🧐
GPU 12volt drops to ~11.8v average


Glad i went with ASUS time time around which is the sole vendor that have taken these problems with the connector serious
(only card with software monitor for amp draw over the pins)

PSU is a dark power 1000w
Have also bought the later released 12v-2x6 / 12vhpwr 90° cable pci-e for this psu
It's really what you would expect, which is why they designed it that way. All things being equal the wires should naturally load balance.

It'd be interesting to see if debauer redid his testing after removing the cable and cleaning each contact with some contact cleaner and abrasion.
 

In2Photos

Platinum Member
Mar 21, 2007
2,378
2,555
136
It's really what you would expect, which is why they designed it that way. All things being equal the wires should naturally load balance.

It'd be interesting to see if debauer redid his testing after removing the cable and cleaning each contact with some contact cleaner and abrasion.
As shown in Buildzoids video though even the Astral card won't load balance correctly.

And how many times have people cleaned and scuffed their 8 pin PCI cables? That should not be required to achieve a balanced load.
 

MrTeal

Diamond Member
Dec 7, 2003
3,869
2,524
136
As shown in Buildzoids video though even the Astral card won't load balance correctly.

And how many times have people cleaned and scuffed their 8 pin PCI cables? That should not be required to achieve a balanced load.
Oh absolutely not. DetOx obviously didn't have to have a balanced load on his.

If each contact-wire-contact assembly has the same resistance, the currents will naturally balance. The fact they're so far off in debauer's video indicated something's really goofy there. The intrinsic resistance of each wire is going to be roughly equal so the issue must be on the connectors. I'd just like to have seen some investigation into why. Is it a surface contamination issue, or mechanical deformation of the contacts causing them to have a poor connection, or possibly a poor crimp on the terminals themselves. I like failure analysis.
 

amenx

Diamond Member
Dec 17, 2004
4,219
2,551
136
I dont see why the 5090 Astrals cable monitoring feature cant be implemented in PSUs as well. If the PSU can monitor the status of each of the 6 power lines and if each is under 9a under load, that should mean things are OK on the GPU side.
 

Heartbreaker

Diamond Member
Apr 3, 2006
4,742
6,247
136
Quick testing in OCCT @ 600w with a ASUS 5090 Astral
AMP spread over the pins work as it should 🧐
GPU 12volt drops to ~11.8v average

View attachment 116857
Glad i went with ASUS time time around which is the sole vendor that have taken these problems with the connector serious
(only card with software monitor for amp draw over the pins)

PSU is a dark power 1000w
Have also bought the later released 12v-2x6 / 12vhpwr 90° cable pci-e for this psu

While that current monitoring per pin is fantastic, I wouldn't want to pay Astral prices to get it.
 

coercitiv

Diamond Member
Jan 24, 2014
7,073
16,281
136
Look how they all come to play once someone else is willing to tank the giant.
So, after some stories that surfaced online about the melting issues of the 12VHPWR power cables for the RTX 5090 and the RTX 4090, I’ve decided to check the one we’ve been using these two years for the RTX 4090.
Before continuing, I want to make it crystal clear that we’ve been using the official power cable for the RTX 4090 for over two years. We haven’t removed it when testing different GPUs. For instance, for benchmarking the RTX 3080, we’ve been using its own power cable. Same applies to the RTX 5080 and the RTX 5090. Moreover, the power cable is still working, and we haven’t encountered any stability issues.

 

NTMBK

Lifer
Nov 14, 2011
10,397
5,620
136
Look how they all come to play once someone else is willing to tank the giant.



View attachment 116971
These things are a legitimate fire hazard. We need to get away from PCIe slots and use a socket that can deliver sufficient power through the board, instead of shoving 500W through these flimsy cables.

(Or, stop buying 500W GPUs!)
 
Jul 27, 2020
23,127
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60 series peek preview.

View attachment 116976
Yeah. Come to think of it, in the old days, a 500W PSU was a big thing. Most pre-builts would have 350W PSUs and you mostly needed a bigger PSU for making your own file server with a dozen hard drives.

Everyone on the ATX 3.0/3.1 committee should be charged a penalty of 10% of their bank balance for creating the 12VHPWR connector because if they can't be trusted to do their job properly, who do users turn to? AI???
 
Reactions: lightmanek

coercitiv

Diamond Member
Jan 24, 2014
7,073
16,281
136
Andreas Schilling from hardwareluxx.de talked about 5000 series cards with AIBs.

Twitter post:
I did talk to some AIBs and they are well aware of the 12V-2x6 problems and wanted to get ahead of it. Colored plugs und LEDs can only mask the symptom. However, there was no second 12V-2x6 on the reference PCB and additional monitoring and protection circuits probably also fell victim to the design templates and time pressure.

Article, selectively quoted below:
The board partners have identified the problems, as the solution from ASUS shows. In some models, MSI also divides the six pins of the 12V-2x6 into two rails on their input, provides them with a shunt resistance, but then leads them together.
 
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