ST551 6Gbps PCIe B+M key to 2 Port SATA 3.0 Card M.2 to dual SATA Adapter

1.Meets PCI Express Base Specification 2.1- lane PCI Express for 2.5 and 5Ghz signaling3.Two ports Serial ATA PHY for 1.5,3.0 and 6Gbps 4.PCI Express Base Specification Rev. 2.05.1-lane PCI Express for 2.5 and 5Ghz signaling6.Maximum payload up to 128 bytes7.Serial ATA AHCI spec,Rev.1.39.Serial ATA Data transfer rates up to 6Gbps10.Downstream SATA II.SATA I11.Support Gen 1m and Gen 2m SATA PHY12.Support Native Command Queue (NCQ)