Amazon
SuperSpeed USB 20Gbps; PCI Express Gen 3x4 lanes; transfer speed up to 32 GT/s Compliant with PCI Express Base 3.1a specification Compliant with eXtensible Host Controller Interface (xHCI) Specification Revision 1.1
SuperSpeed USB 20Gbps; PCI Express Gen 3x4 lanes; transfer speed up to 32 GT/s Compliant with PCI Express Base 3.1a specification Compliant with eXtensible Host Controller Interface (xHCI) Specification Revision 1.1