Which Pcie slot for gpu : rbuildapc

Which Pcie slot for gpu : rbuildapc pciex1_1 slot Having read about the possible problems with on-board USB I purchased the recommended Inateck PCIe card, which I've installed in the top expansion slot bola slot 855 slot; but, there is a note in the manual stating: Due to a hardware limitation, the PCIEX1_1 slot can only accommodate a shorter PCI Express x1

bola slot 855 If PCIEX4_3 is not occupied or runs at X1, PCIEX1_1, PCIEX1_2 and PCIEX1_3 will be enabled The PCIEX4_3 slot will run at X4 mode for

opera slot 2 M-key slot supports both SATA and NVMe drives The manual also adds an important detail: Socket 3 shares bandwidth with PCIEx1_1 and So I've been wondering if PCIE x1 slots can are as fast as my SSD? My SSD has around 500 mbs read and write, so I need the PCIE x1 slot to have