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I have a GTX[0] 1070(500W) working on a Dell[1] Power Supply (apparently 220W).

Another GPU with the same power specs is not working: GTX[3] 1080 (500W) returns NVRM: GPU 0000:05:00.0: GPU does not have the necessary power cables connected. as result of sudo dmesg |grep NVRM

Why is one working and the other is not?

The gpu's are attached to a notebook using a pci-e adapter[3]

[0] https://www.gigabyte.com/Graphics-Card/GV-N1070G1-GAMING-8GD-rev-10/sp#sp

[1] AC/DC Adapter DA-2 Series MK394 Model D220P-01 Output 12V 18A

[2] https://www.palit.com/palit/vgapro.php?id=2609&lang=en&pn=NEB1080T15P2-1040G&tab=sp

[3] https://www.aliexpress.com/item/32824725772.html

Remarks

The power supply powers only the gpu, nothing else

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4
  • 2
    You've listed the 1070 twice, but best guess is not the total power requirement but the power per rail that's coming up short. Either way, once you ramp up the performance on either of them, the machine is likely to fall over.
    – Tetsujin
    Commented Jan 23, 2021 at 11:58
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    The GPU does not use '500w' itself but rather that the overall recommendation for a system with a video card of that type installed. I believe the 1070 pulls about 150w at load, so most likely it is something with the power connection on the second card, or the strange 3rd party adapter you're using with a (possibly proprietary) Dell PSU.
    – Hefewe1zen
    Commented Jan 23, 2021 at 13:48
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    You listed the same card twice making it impossible to answer your question
    – Ramhound
    Commented Jan 23, 2021 at 14:04
  • So sorry for all your inconvenience, fixed the 2nd gpu's url: palit.com/palit/…
    – jjk
    Commented Jan 23, 2021 at 16:06

1 Answer 1

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The specs for the GEFORCE GTX 10 SERIES say this:

GTX 1080
Graphics Card Power [W] : 180 W
Recommended System Power (W) : 500 W

GTX 1070
Graphics Card Power [W] : 180 W - 150 W
Recommended System Power [W] : 500 W

If the GTX 1070 only needs 150 W at full load, it can work with a 220W power supply. However, that would mean that the rest of the system is drawing very little power, or that the 220W power supply performs above its specs.

The GTX 1080 needs 180W at full load, but the rest of the system needs to draw less than 320W. In addition, many power supplies rated at 500W actually deliver much below their rating.

It is possible that you were lucky with one power supply and unlucky with another. In any case, don't use under-powered power supplies if you care about your hardware.

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6
  • Thank you. The power supply powers only the gpu, nothing else
    – jjk
    Commented Jan 23, 2021 at 16:08
  • How is that possible? Is it a custom-built computer?
    – harrymc
    Commented Jan 23, 2021 at 16:52
  • [3]: aliexpress.com/item/32824725772.html
    – jjk
    Commented Jan 23, 2021 at 20:41
  • In that case, the 500W power supply is either not 500W, is perhaps old and tired, or the error message is wrong and the video driver just doesn't understand this setup.
    – harrymc
    Commented Jan 23, 2021 at 20:48
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    Only good quality power supplies really live up to their rating. For example, I have met a 500W supply that couldn't do 450W. 220W is perhaps too near to 180W. You should always use a power supply leaving a large margin for error.
    – harrymc
    Commented Jan 24, 2021 at 9:48

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