Dual NVMe PCIe Adapter,M.2 NVMe SSD to PCI-E 3.1 X8/X16 Card Support M.2

The cost per SSD is PCI-e 3.1 x4 channels, not the entire PCI-e 3.1x8. (The final speed depends on the PCI-e bandwidth of SSD and Mobo). Hardware RAID is not supported. 2x SSD mounting screws. 1x slim PCI-e bracket.

StarTech.com - DUAL-M2-PCIE-CARD-B - M.2 PCIe SSD Adapter Card, x8

Shop StarTech.com U.2 to PCIe Adapter - x4 PCIe - For 2.5 U.2

StarTech.com Dual M.2 PCIe SSD Adapter Card x8 x16 Dual NVMe or

M.2 NVME M Key SSD to PCIE X4 X8 X16 Expansion Card - China STC

Quad NVMe PCIe Adapter, RIITOP 4 Ports M.2 NVMe SSD to PCI-e 4.0

NVMe to PCIe Adapter, RIITOP M Key M.2 PCIe SSD to PCI-e x4/x8/x16 Con