Indeed, 10Gbps cards and adapters run very hot. I placed an 80mm right under the card in a PCI fan mount to keep the expansion card cool. The fan does not need

Indeed, 10Gbps cards and adapters run very hot. I placed an 80mm right under the card in a PCI fan mount to keep the expansion card cool. The fan does not need to spin fast, but some directed airflow seems absolutely necessary.