PCIe 4X to 4 SATA III 6Gbps interfaces; transfer speeds up to 6Gbps; backwards compatible with SATA 1.0/2.0 of 1.5/3.0Gbps. PCI-Express V2.0 also compatible with PCI-Express V1.0, can be used on PCIe X4 X8 X16 slots. Port Multiplier FIS-based and Command-based switching supported; Chipset: Marvell.