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x299 UD4 Pro-How to enable PCIe x16?

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  • x299 UD4 Pro-How to enable PCIe x16?

    So I got a x299 UD4 Pro with a I7-9800x and no matter what I see to do, I can not get any GPU (I have tried at least four different ones) to operate at x16. To make things even more strange, in slot #1, you know, the typical GPU slot, I can only manage to get x4. In slot #3, I can get x8. I have updated to the latest BIOS, F8a, and still can not get x16.

    Anyone have a clue what I am doing wrong?

  • #2
    There's the possibility you have a bad CPU mount

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