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Your board is more than six years old. As you say, it is PCI 2.0 compliant. There is no way your board could predict the future and know about PCIe 3.0.
Your card likely claims backward compatibility. You should be asking the card manufacturer to update their firmware to make the card truly backward compatible. Or, you should purchase a card that is known to work on PCI 2.0 on your board.
This message was posted on behalf of Intel Corporation