3XDual NVMe PCIe Adapter, M. 2 NVMe SSD to PCI-E 3.1 X8/X16 Card Support M. 2 (M6)
Each SSD costs PCI-e 3.1 x4 Channel, NOT whole PCI-e 3.1 x8. Each SSD costs PCI-e 3.1 x4 Channel individually, non-interfering. (The final speed depends on the SSD and the's PCI-e bandwidth).