Unable to use 2nd NVME SSD

2 compatibility between old and new motherboards 8:21 2 vs NVME: What's the

; Motherboard via one of: PCIe ×4; PCIe ×4; PCIe ×4; Serial ATA · USB · Intel · Phison · Realtek · Samsung · Silicon Motion · SK Hynix

m24 slot On higher end boards, or ones that support CPUs with a lot of CPU lanes, you may have multiple PCI slots that are directly connected to the

m2 sata vs nvme slot 2 SSDs are keyed at both M and B positions, so they can fit in SATA slots and PCIe , even if they might not work in the latter NVMe SSDs are keyed only