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B450 Pro4 M2_2 and PCIE4

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NeoTrantor View Drop Down
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    Posted: 18 Sep 2021 at 1:54am
Hi,

today I put a PCIe card into PCIE4 but the card (LSI 8708EM2 RAID controller) was not recognized. Its BIOS doesn't show up and its also not listed in the lspci output.
I tested another card which also didn't work. Both tested cards work in another PC.
Now, the manual says, PCIE4 is being disabled if M2_1 is used but it isn't. I have a M2 SSD in M2_2 (the slot at the bottom of the board / next to the very last PCI slot just to make sure I didn't mix them up) but M2_1 is not used.

Any ideas what I could have done wrong?
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