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this post was submitted on 09 Dec 2023
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For starters, not having the GPU power cable plugged in won’t damage anything. If you were to keep it powered on, you likely wouldn’t get any display output at all and more than likely would get an error or the OS would fail to boot.
The graphics card should also have a fail safe to keep from damaging itself on low power. It’s worth mentioning that the graphics card can pull some power from the PCI-E lane, but not enough to run the card on its own.
Seems to be OP's concern. And for anyone coming along, otacon239 is 100% correct.