NV 12VHPWR issues revisited

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Heartbreaker

Diamond Member
Apr 3, 2006
4,949
6,512
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Some interesting tidbits from the connector specs in the PCIe_CEM_R5.1_V1.0 documentation:

To me this shows increased reliance on the testing and the quality standards of each manufacturer. The 9.2A per pin load is actually the minimum requirement before testing. The final max rating can be anything based on connector side-load testing


"The specific wire, connectors and manufacturing process used for a cable assembly must be designed to accept the current imbalance due to contact resistance variability and side loading"

How the heck are they supposed to do that? It may be that they are expecting minor imbalances, so It can handle 10 or 11 amps, but we are seeing much worse in some cases.

It seems like they need some kind of Apple-like cable/connector approval process, where many samples are torture tested.

I remember the recent issues Der8auer had with his properly plugged in cable with no side loads. These were not minor current differences, he had 2, 4, and 5 amps on some wires and 23 amps on one of them.

To get those kind of imbalances, he had to have multiple very poor conductor/connection in the set. Which kind of points to a poor manufacturing process somewhere.

I was a little disappointed that he didn't investigate into the source of that cables issues (He plugged in a new cable and everything was fine). My curiosity would be why was the original cable so bad? It's rare to catch something this bad before it melts obscuring the original problem, so it was a unique investigation opportunity.
 
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Reactions: Elfear

DrMrLordX

Lifer
Apr 27, 2000
22,571
12,435
136
Techpowerup sums it up nicely:

lol

I thought there were a few of them? It's not like anyone can realistically buy one at this point so, the point is good enough. Needless to say, unless there are 5090s with two connectors out there from AIBs, the 5090 is substantially worse.
 
Jul 27, 2020
24,510
17,056
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I'm so glad that I'm free of the stress of owning a halo Geforce GPU: https://www.overclock.net/posts/29460965/

...and lastly i will need a new gpu as moving around the 4090 is not a wise choice with such a notorious connector design that has already bbq'ed a bit 3 cables do far.

That is really sad that people who paid cold hard cash are so scared of potential issues that they are not even moving the cards between their own rigs lest they get bitten by this infamously notorious engineering flaw.
 

DaaQ

Golden Member
Dec 8, 2018
1,854
1,309
136
I'm so glad that I'm free of the stress of owning a halo Geforce GPU: https://www.overclock.net/posts/29460965/



That is really sad that people who paid cold hard cash are so scared of potential issues that they are not even moving the cards between their own rigs lest they get bitten by this infamously notorious engineering flaw.
I will keep my 3x8 pin. Hell 4x8 pin if they still made them kind of cards.
 
Reactions: dr1337

gorobei

Diamond Member
Jan 7, 2007
3,927
1,409
136
derbauer on seasonic's early prototype 12vHFail psu with per pin current monitoring. shunt resistors on the pus only monitor but cant do anything to adjust current. theoretically they will have software warning you when something happens and you will have to stop the load.
still doesnt fix the problem at the source.
 
Reactions: Ranulf

H T C

Senior member
Nov 7, 2018
607
442
136
derbauer on seasonic's early prototype 12vHFail psu with per pin current monitoring. shunt resistors on the pus only monitor but cant do anything to adjust current. theoretically they will have software warning you when something happens and you will have to stop the load.
still doesnt fix the problem at the source.

All i'm saying ...
 
Jul 27, 2020
24,510
17,056
146
theoretically they will have software warning you when something happens and you will have to stop the load.
Logging the event and shutting down the PSU would be better from a safety perspective (why wait for the user for "just a few minutes more of this shootin' tootin'" and the damage could still get extensive).
 
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