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Follow the specs :) (was Re: AMD GPU hard lockups)

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On 02 Aug 2023 23:29, Celejar wrote:
 > But reputable companies do produce 6-8 pin adapters, e.g.:
[...]
 > (I just ordered the Cable Matters one.)

Out of curiosity, I checked the links.
Funny that "reputable companies" (I'm not attacking you, but them) don't 
even specify the max power rating as product specs, and when specified, 
it's only in users Q&A ...
You also have to dig deep to get the wires size in AWG (ie: zoom on 
pictures ...) !
Compare that to the information you get for the PSU and the GPU !

Anyways :
1st link: "The maximum power rating for the PCIEX68ADAP is 75W"
2nd link: "Max Power Rating 150W"
3rd link: (nowhere to be found, at least quickly)

1 and 2 use AWG18 wires, and on 3 they look even thinner (can't really 
tell as the pic is s***).
I'd eliminate the 3 from the start. No specs, no money.
And either 1 or 2 is lying : same AWG, different power rating (ok, the 
wire style is precised nowhere : single core, threaded, etc). But we can 
safely assume that 150W @12V is not possible : 12.5A is out of specs.
(Try "https://www.engineeringtoolbox.com/wire-gauges-d_419.html" for 
more info on AWG, and use the formula Watts = Volts x Amperes).

On 02 Aug 2023 23:37, piorunz wrote:
> Your GPU max TDP is 150W, meaning it will draw 75W from PCI-E slot and
> 75W from 8-pin cable.

So the wires will work around their limits.
One little power spike and kaboom.
Fire, exclamation mark ; fire, exclamation mark.
Joke aside, the fire hazard is real. Especially exceeding limits with 
low-end products, when you don't know if the materials are fire-proofed.

> Your 8-pin adapter must have been very poor quality. I don't know what
> kind of adapter it was, but adapters which make 8-pin from 6-pin, are
> dangerous. Better to use 2x 6-pin -> 1x 8-pin adapter to correctly
> assign wires to each corresponding pin.

I agree, so that each wire (or group of wires) does not exceed the max 
current it can draw.

I found two pages cleanly explaining this, both were worth a read.
But don't quickly jump to conclusions, follow the flow !

https://www.cgdirector.com/gpu-power-cable-guide/
https://www.pcworld.com/article/395059/one-cable-or-two-for-powering-a-graphics-card-heres-the-answer.html


-- 
zithro / Cyril

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Thread

AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-01 17:50 +0200
  Re: AMD GPU hard lockups piorunz <piorunz@gmx.com> - 2023-08-01 18:00 +0200
    Re: AMD GPU hard lockups Dan Ritter <dsr@randomstring.org> - 2023-08-01 18:40 +0200
      Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-01 19:20 +0200
    Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-01 19:20 +0200
      Re: AMD GPU hard lockups piorunz <piorunz@gmx.com> - 2023-08-01 19:30 +0200
        Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-01 20:10 +0200
          Re: AMD GPU hard lockups piorunz <piorunz@gmx.com> - 2023-08-01 20:20 +0200
            Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-02 03:30 +0200
              Re: AMD GPU hard lockups zithro <slack@rabbit.lu> - 2023-08-02 23:20 +0200
                Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-02 23:40 +0200
                Re: AMD GPU hard lockups piorunz <piorunz@gmx.com> - 2023-08-02 23:40 +0200
                Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-03 01:30 +0200
                Re: AMD GPU hard lockups zithro <slack@rabbit.lu> - 2023-08-03 02:10 +0200
                Re: AMD GPU hard lockups Celejar <celejar@gmail.com> - 2023-08-03 16:40 +0200
                Follow the specs :) (was Re: AMD GPU hard lockups) zithro <slack@rabbit.lu> - 2023-08-03 01:40 +0200
                Re: Follow the specs :) (was Re: AMD GPU hard lockups) Celejar <celejar@gmail.com> - 2023-08-03 03:00 +0200
                Re: Follow the specs :) (was Re: AMD GPU hard lockups) gene heskett <gheskett@shentel.net> - 2023-08-03 03:30 +0200
                Re: AMD GPU hard lockups Cindy Sue Causey <butterflybytes@gmail.com> - 2023-08-03 05:00 +0200

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