If your camera is “USB3”, and actually runs at those speeds, then this would tend to imply USB3.1 gen. What was previously 5Gbps USB3 became known as USB3.1 generation 1. Later, a faster bandwidth of 10Gbps was introduced. Originally the first USB3 was just “USB3”, and supports 5Gbps bandwidth. So there is a question as to whether the camera must run as USB3 (typically for higher framerates and resolutions), or if it can fall back to USB2 while connected to a USB3 root HUB. Such “compatible” phrasing also tends to imply the device actually runs at such speeds without actually having to say so. Many USB devices say “USB3 compatible” because they don’t want you to not buy their slower product thinking it won’t work on USB3. On the other hand, just because a camera is “USB3 compatible”, it does not mean it runs as USB3. A single camera could consume the entire bandwidth. I can’t answer the limit, but if the camera itself is USB3, then likely you can only use one camera on one USB3 root hub due to bandwidth limitations.
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