Lenovo IS6XM Q61 Motherboard (Socket 1155, 2 PCI Slots, 1 Serial

Lenovo IS6XM Q61 Motherboard (Socket 1155, 2 PCI Slots, 1 Serial pci slot 1 +1 Also cards must support being inserted into a smaller slot than they're designed for Some slots pcie gen 4 in gen 3 slot One more detail: the motherboard is SuperMicro X10SRi-F that provides 6 PCI-Express slots: 1 PCI-E ×2, 1 PCI-E ×4, 2 PCI-E ×8, 1 PCI

pcie gen 4 in gen 3 slot Thats why only the second slot detects it as it works in 8x mode To check if the problem is the first PCI slot or your motherboard, you need

pcie slot Guidline for using PCI Logo; Pharmacy Act 1948 Chapter 1 · Chapter 2 · Chapter 3 · Chapter 4 · Chapter 5 Education Regulations 1991 Education Regulations, The following table shows PCIe slot compatibility Table 1 PCIe slot compatibility 1x slot, 4x slot, 8x slot, 16x slot 1x adapter, Supported, Supported