Dual M.2 NVMe on One PCIe X8 Slot - Run two M.2 NVMe SSDs at the same time from a single PCIe x8/x16 slot. Fits 22110/2280/2260/2242/2230 M.2 NVMe SSDs.Check Your Motherboard First - This is a passive adapter with no bifurcation chip. Your motherboard must support PCIe Bifurcation (X4X4X4X4, X4X4X8 or Hyper M.2 X16 mode), and you must enable it in BIOS. Without bifurcation, only the NVMe-1 port is recognized. Not compatible with X8X4X4 mode, and not for Mac Pro 5.1.Up to 64Gbps per Drive - Each SSD gets a dedicated PCIe 4.0 x4 link. Full PCIe 4.0 speed require a PCIe 4.0 CPU (Intel 11th Gen or newer), a PCIe 4.0 motherboard slot and a PCIe 4.0 M.2 SSD. Backward compatible with PCIe 3.0 and 2.0 at their own speeds.Soft RAID via OS Tool - There is no onboard RAID controller, so RAID is built by your operating system: RAID 0 or RAID 1 through Windows Disk Management, Storage Spaces or Linux mdadm, on Intel and AMD platforms. Intel VROC (RAID-on-CPU) requires a separate license purchased from Intel.Bootable OS Drive - Reinstall your operating system and set BIOS/UEFI to boot from the M.2 NVMe SSD on this adapter. Some older motherboards cannot boot from NVMe; in that case the SSDs still work as high-speed storage drives.