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
