M.2 NGFF PCIe based SSD works in main board PCIe x4 bus slotPCI Express 3.0 x4 Lane Host adapterSupports PCIe Gen3 and PCIe Gen2 M.2 NGFF 80mm・ 60mm・ 42mm SSDSupports PCIe 1.0 ・PCIe 2.0 and PCIe 3.0 motherboardNote: this adapter is only for 'M' key M.2 PCIe SSD such as Samsung XP941 SSD. Not compatible with a 'B' key M.2 PCIe x2 SSD or 'B' key M.2 SATA SSD.