The connection is a pair of male and female pins and both seem to have been overloaded. The issue is the load across the six pairs not being equal and that’s down to the interface between pin and socket. Swapping the PSU/cable is as likely to make the situation worse as it is to make it better.
Personally I’d hook the card back up, put it under load and monitor the temps along the cable, then take it from there.
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