PCIe Gen 4 vs Gen 3: Do you need to spend extra on SSDs?
M.2 NVME SSD to PCIe 4.0 Adapter Card 64Gbps M-Key PCIe4.0 X1 X4 Adapter for Desktop PC PCI-E GEN4 Full Speed - AliExpress
PCI Express Gen 4 Carrier Board for four M.2 PCIe SSD modules | Amfeltec Corporation
x4 PCI Express to M.2 PCIe SSD Adapter - Drive Adapters and Drive Converters | Hard Drive Accessories | StarTech.com
PCI-E Split Card PCIe 4.0 X16 to M.2 NVME M Key 4 SSDs RAID Array Adapter Card | eBay
PCI-E 4.0 4x4 to M.2 NVMe 4-Bays Expansion Card for M.2 NVMe Solid State Drive SSD PCIe X16 4.0 Gen4 4-Disks Split Adapter Cards - AliExpress
Amazon.com: Dual M.2 SSD NVME (m Key) or SATA (b Key) to PCI-e 3.0 x 4 Host Controller Expansion Card with Low Profile Bracket and Heatsink for Desktop : Electronics