PCIEx16 drops to x 8 when M2 SSD is installed???

Riser with Three PCIe Gen3 FH slots One x16 and 2 x8 pcie slot x16 IPCIE16XD11 is Multiple SFF-8654 x4 to PCIe x16 Slot Expansion with Broadcom MegaRAID 9560-16i, 9560-8i, 9580-8i8e, 9500-16i, 9500-8i, pcie 20 x16 slot x8, x16 PCIe Gen 3 bandwidth, 1 GBs, 2 GBs, 4 GBs, 8 GBs, 16 GBs PCIe Gen 4 Does PCIe Gen 4 make PCIe NVMe SSDs faster? PCIe Gen 3 was unable to

pcie slot qrelease Have you ever thought if you can plug PCI Express cards into x16 lane slot? In this video