Supposing all Hardware parts are working properly, would the GPU show up inside the device Manager if I plugged it into the PCIe Slot of the Motherboard without connecting the GPU to the PSU?

In case the answer requires a specific Hardware, here are my specifications:

  • MOBO: P8B75 M-LX
  • PSU: Coba 650Watt Bronze 80 plus
  • GPU: msi R9 290x gaming 4GB
  • Is there a reason you have connected your GPU to the power supply? Are you having specific issues? Mar 29, 2017 at 23:21
  • my GPU does not show up in the device Manager, so I was told either the GPU or the PCIe of the Mobo could be broken. I wanted to collect more possibilities if there are any further. So, I imagined if a third possibility of why the GPU doesnt show up could be the lack of a Connection to the PSU.
    – sharkant
    Mar 29, 2017 at 23:25
  • Does your GPU have a power connector on it? This should be relatively obvious, and if it isn't, the installation instructions for the card should note whether or not this connection is necessary. Mar 29, 2017 at 23:29
  • yes, it has two connectors, one with 6, one with 8 Pins.
    – sharkant
    Mar 29, 2017 at 23:31
  • 1
    thx, i will sleep over and think how to improve it without making it worse
    – sharkant
    Mar 30, 2017 at 0:15

1 Answer 1


Depends on the GPU. I do not have a MSI R9 for testing. Even if I did, I wouldn't unplug the power connectors for your question.

I know that Nvidia Quadro series (K2000 thru to the M10 tesla cards) do - they just won't let Windows know if there's a monitor attached; but it shows in device manager (assuming you can access via another display or RDP). If you run Nvidia's Control panel or the CLI tools it'll actually prompt you that the card is not properly powered.

It is logical that the card behave in unexpected ways. It may not detect at all, it may detect as device which is expecting a firmware update, or it might detect as a display adapter but just not output a picture. To answer your question in 1 line: yes, it is a possibility that your PSU connectors aren't working properly and that's why the GPU isn't working properly.

The internet does have reports of cards breaking themselves by not plugging in the correct power so exercise caution. Personally I'm doubtful these reports are real.


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