There is one more crazy advice, you can see small mesh on top or the the side of PCI slots, measure it in metric system, I would try to see if the measurements at least 40 mm wide - you can stick extra exhaust 400 mm or 50 mm fan, not huge improvement, but better than nothing. PCI fan is another solution, I would look for an exhaust fan as well, intake air will find its way in.
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