Add 4 Internal SATA III (6 Gbps) ports to a computer through a PCI Express x 2 slot. The PEXSAT34RH 4-Port PCI Express 2.0 SATA Controller Card with Hyper Duo adds 4 AHCI SATA III ports to a computer through a PCIe slot (x 2), delivering multiple internal 6 Gbps connections for high-performance hard drives & Solid State Drives (SSDs).