Many PSUs give 'pigtail' (Y splitter) PCIe cables to help power your PCIe devices, but unfortunately many modern GPUs need so much power that it's not always advisable to use a pigtail to solely power your graphics card.
But this raises the question: why does the pigtail cable exist then? And why do PSU makers still give them to us?
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Credits
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Thanks to the following resources (sounds, images etc):
"Pop-up Sound" by BeezleFM (Freesound -- License: Attribution 4.0)
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#PCBuild #GraphicsCard #PowerSupply