Just a thought.
How many plugs have you connected to the card? the RTX cards require two or three power leads connecting depending on the model, my RTX 3080 OC has two
How have you connected them, i know some have a splitter lead supplied at the card end, but you also need two separate leads off the power supply, not just a single split lead if that makes sense.
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https://www.overclockers.co.uk/forum...able.18899178/