This product is either discontinued or we cannot get that from suppliers.
SUNIX Dual Ports USB2312, PCI Express Spec 2.0, Dual-Lane (x2), Controller PCI Express USB 3.1 Host controller, Asmedia ASM1142, USB Standard eXtensible Host Controller Interface (xHCI) Rev1.1, Universal Serial Bus 3.1 / 3.0 / 2.0 / 1.1, SuperSpeed+(10Gbps), SuperSpeed(5Gbps), High Speed (480Mbps), Full Speed (12Mbps), Low Speed (1.5Mbps).
SUNIX USB2312 is a dual-port Super-Speed USB 3.1 PCI Express Add-on card, and it’s compliant with the PCI Express Generation 2 (Dual-lane x2) specification for host PC system. It works up to 10 Gbps for data transfer when connecting to USB 3.1.