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You will not be able to enable Crossfire if one of the cards is in a slot that is being id'd as running at PciE 1x.
You should look to updating your motherboard chipset drivers and resolving that issue before you try to enable Crossfire.
Oh actually I found that the second slot Pcie is 1x by default. Then, I went to Bios to find the option under (Onboard Device Configuration) to change to 4x.
Then the Crossfire option pop up in ccc