‎Aurora R13, PCIe x4 slot not working?

‎Aurora R13, PCIe x4 slot not working? pciex4 slot The PCIe x4 Gen2 backplane supports a PCIe Gen2 target cable adapter installed in the OSS target slot and one or more PCIe x16 expansion cards caishen riches slot 22802242 M-Key x 2, 30423052 B-Key x 1 + Micro SIM Slot x 1, Mini PCIe x 1 + Micro SIM Slot x 1 PCIe x 1 PCI

houten kast met slot However, the 2nd PCIe x16 slot works at PCIe x4 if two GPU are connected means the primary PCIe x16 slot gets 16 lanes and I still have 4 lanes