this always aludes me, GPU numbers seem so random - the easiest way is to press the number 7 on your keyboard while mining, this will disable the card in question - then you can see which fan spools down. Just press 7 again to restart the card
press 7 in the claymore window during runtime to disable the GPU. Open MSI afterburner or wattman or some GPU management tool and identify which card "GPU 7" is by the lower temperature. Then stop the miner, and set the fan speed of that one identified card to 100%. Should be pretty easy to identify after that
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Check the risers one by one, I mean everything from power to cables and the card slot!
This will be the issue!