Products/ Host Cards / PCIe x2 / USB 3.1 Gen 2


2-port (Type-C & Std-A)USB 3.1 to PCI Express x4 (x2 mode) Gen 3 Host Card w/PD 2.0

  • Host Bus: PCIe x4 (x2 mode) Gen 3 ; Low Profile PCI Form Factor
    • Compliant with PCI Express Base Specification Revision 3.0
    • It can configure as PCIe x2 Gen3
  • 2-port USB 3.1 Host Controller (Asmedia ASM2142, USB IF TID 5080000005)
    • Compliant with Universal Serial Bus 3.1 specification Revision 1.0
    • Compliant with Intel’s eXtensible Host Controller Interface (xHCI) specification Revision 1.1
    • Type C Receptacle, USB IF TID 5200000033 & Std-A Receptacle, USB IF TID 360000006
  • Compliant with USB Power Delivery Specification Revision 2.0
    • Supports Profiles (5V/3A , 12V/3A)

U31-PCIE2XG321 is a 2-port USB 3.1 Gen-II (10Gbps) to PCI Express x4 (x2 mode) Gen 3 Host Card. U31-PCIE2XG321 is designed with the new generation Universal Serial Bus XHCI host controller, bridging PCI Express to USB3.1 Gen-II, compliant with USB 3.1 Specification Revision 1.0 and Intel eXtensible Hot Controller Interface specification revision 1.1,. U31-PCIE2XG321 supports two USB 3.1 Gen-II (10Gbps) ports and perform trusting high speed bandwidth with PCIe Gen-III x2 supporting. It also supports backward compatible with legacy USB function and devices, compliant with UASP (USB Attach SCSI Protocol) Revision 1.0, supporting the XHCI debug capability.

U31-PCIE2XG321 supports the proprietary driver for Windows 7 and inbox driver for Windows 8.0, Windows 8.1, Windows 10 and various Linux Kernels.
Technical Specifications
PCIe Host Bus
  • Support PCI Express Gen-III x2
  • Support high bandwidth performance with low latency
  • Support PCI Express Link power management
  • Compliant with PCI Express Base 3.0 Specification
  • Compliant with PCI Express card Electromechanical 2.0 specification
  • Compliant with PCI Express Mini Card Electromechanical 1.2 specification
  • Compliant with PCI Bus Power Management Interface Specification Revision 1.2
  • Compliant with PCI Local Bus Specification Revision 3.0
  • Integrate Spread Spectrum Controller for PCI Express interface
  • Overclock capability on PCI Express bus
USB Features
  • Support two ports of USB 3.1
  • Up to USB3.1 Gen-II 10Gbps
  • Compliant with Universal Serial Bus 3.1 Specification Revision 1.0
  • Compliant with Universal Serial Bus Specification Revision 2.0
  • Compliant with USB Attached SCSI Protocol Revision 1.0
  • Support USB3.1 and USB2.0 Link Power Management
  • Support Control, Bulk, Stream, Interrupt, Isochronous transfer type
  • Support independent port power control
  • Support overcurrent detection
  • Support Remote/Wakeup event
  • Integrate Spread Spectrum Controller for USB3.1 interface
  • Backward compatible with Legacy USB function and device
  • Support the Debugport
Number of USB Ports
  • Two USB 3.1 Cable Ports
    • Type C Receptacle, USB IF TID 5200000033
    • Std-A type Receptacle, USB IF TID 360000006
USB3 cable lock mechanism
  • Provides the threaded holes for the jack-screws of USB 3.1 Plug w/Jackscrew lock Cable

USB Power Delivery

Power Delivery Specification Revision 2.0, Version 1.1

  • Supports Profiles (5V/3A , 12V/3A)


USB Bus Power Input

  • USB bus power (5V) is stepped down from PCIe 12V
  • PD 12V is from Power Connector (SATA 15-pin)
Computer Platform
  • Computer with PCI Express slot ( x4, x8, x16)

For the best performance, It should be installed in a PCIe Gen 3 compliant slot in the host computer.

Operating System Requirements
  • Inbox driver for Windows 8 later, Linux (kernel 3.x.x later)
  • Supporting the proprietary driver for
    • Windows 7
    • Windows server 2003
    • Windows server 2008
    • Windows server 2012
Physical Dimensions
  • 64.4mm(H)x81mm(L)
  • NW: 43.2g
Kit includes
  • U31-PCIE2XG321
Optional Accessories
  • Low Profile PCI Bracket
    • BR-00194-20-1020
Version: 1.16.472 Date: 2018/2/6
Content: USB 3.1 Host Controller Driver For Windows 7, Windows server 2003, Windows server 2008, Windows server 2012 R2 x64 Download