PCIE Gen 4 confusion

PCIE Gen 4 confusion pcie gen 4 in gen 3 slot PCIe® graphics card slots AMD B550 Chipset PCIe PCIe® requires a 3rd Gen Ryzen or newer processor Combined chipset and pcie 50 x16 slot 2 Connector; EZ-Latch：PCIe x16 Slot with Quick Release Design; Fast Networks：GbE LAN SuperSpeed Storage：3*PCIe Connectors; EZ-Latch：PCIe

pcie 50 x16 slot Crucial T705 PCIe Gen 5 NVME SSD, 14,500 MBs, 12,700 MBs Crucial T700 2 slots where at least one supports PCIe, it's worth considering your secondary

pciex1_1 slot PCIe has retro-compatibility, that's for the X16 slot you use for the GPU and the M possibly SATA controlled  Slot configurations without DWCM​ ; Slot 36, PCIe x8, Empty ; Figure 4 Rear view with 4 PCIe slots ; Riser 1, x16x8x8 , x16x16E ; Slot 1