Up to 2700M/S Adapter Card to PCI-E 4X for M.2 NGFF SSD 950Pro XP941 SM951 M6E SSD adapter M.2 NGFF PCIe based SSD works in main board PCIe x4 bus slot PCI Express 3.0 x4 Lane Host adapter PCIe Gen3 and PCIe Gen2 M.2 NGFF PCI-E 4X NGFF M.2 M key M + B key adapter Not compatible with a 'B' key M.2 PCIe x2 SSD or 'B' key M.2 SATA SSD. Up to 2712M / S speed (X99 + intel 750 2.5" 1.2T + M.2 to U.2 Add-in Card )