Add 4 SATA 6 Gbps ports to a computer through a PCI Express x 4 slot. The PEXSAT34 4-port PCI Express SATA 6 Gbps Controller Card adds 4 internal SATA ports, along with a shared e SATA port to a desktop computer through a PCIe slot (x 4), providing both an internal & external SATA 6 Gbps connectivity solution from a single card.