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Most USB PCIe add-on cards are single chipset and the ports share the available bandwidth.

Theoretically, if I have two USB 3.1 Gen I devices that each can saturate the 5Gbps bandwidth, attaching them to a USB 3.1 Gen I add-on card will limit each to 2.5Gbps.

Will attaching two Gen I devices to a Gen II add-on card allow each to run at its full 5Gbps, being Gen II is 10Gbps?

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  • I heard people claim bandwidth sharing works for them reliably with certain combinations of host, devices, drivers & cables, but I'll believe it when I see it. Strong recommendation to not depend on it in a production setting.
    – anx
    Oct 8, 2020 at 17:42
  • @anx Update that bandwidth sharing definitely doesn't work under VMWare PCI passthrough Oct 20, 2020 at 0:20

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