C6678 PCIe GEN2 problem - Processors forum

PCIe Slot Configuration Setting in BIOS pcie slot configuration gen1 gen2 gen3 A PCIe 4 is backwards compatible with Gen 1, Gen 2, and Gen 3 while Gen 1, 2, or 3 can slot into a Gen 4 And with the release of PCIe Gen 5 pcie x16 expansion slot The PCIe Gen 3 Switch allows users to take advantage of a single PCIe x8 slot, through the use of QIP2X-PCIE8XG302, and transform their PCIe

pcie 4 card in pcie 3 slot Try changing the bios settings for the slot you are using from what ever it is to GEN1