StarTech.com 2 Port PCI Express SATA 6 Gbps eSATA Controller Card - Dual Port PCIe SATA III Card - 2 Int/2 Ext - SATA III 6Gbps (PEXESAT322I) - Storage controller - 2 Channel - SATA 6Gb/s / eSATA 6Gb/s - low profile - PCIe x1 - for P/N: S251SMU33EP, S3520BU33ER, S355BU33ERM, ST521PMINT