SilverStone Technology Internal PCI-E Expansion Card with USB 3.1 Internal 19-Pin Connector RL-ECU04 Includes USB 3.1 internal 19pin connector PCI-E Gen2.0 x2, throughput up to 10Gbps Compliant with eXtensible Host Controller Interface (XHCI) specification Revision 1.1 Compliant with USB Attached SCSI Protocol (UASP) Revision 1.0 Includes optional low profile slot cover for supporting low profile cases