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. Color: black.
New PCIE X8 M.2 2 port SSD Adapter Expansion Card Dual M-key Converter Adapter
StarTech.com PCIe x8 Dual M2 PCIe SSD Adapter Card DUAL-M2-PCIE-CARD-B
U.2 SSD to PCIe X8 Adapter PCIE 4.0 to Dual 2x U.2 SFF-8639 Disk Riser Card
