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USB 3.0 -> USB 2.0 "Splitter"

post #1 of 4
Thread Starter 
If I have 4 USB 2.0 flash drives plugged into a USB 3.0 hub,
Then plug the USB 3.0 HUB into my computers USB 3.0 port.

Does the USB 2.0 data have to flow exclusively on the USB 2.0 data pins?
Or can the hub send the USB 2.0 data over the faster USB 3.0 pins, allowing for full speed of all 4 USB 2.0 devices?


So The 4 USB 2.0 flash drives would get about 40MB/s each?
or More like 10MB/s each?
(Assuming all 4 in use at the same time)

Thanks
Edited by justinjja - 2/26/16 at 7:30pm
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post #2 of 4
I would guess depending on the quality of the USB controller being used in the hub, it might be capable of offloading the work load to the USB3 system rather then limiting it to the USB2.

I would try running benchmarks to see how the hub is performing.
Shouldn't be hard to saturate the USB2 stuff to see if it is able to use the extra bandwidth of USB3 to serve more devices.
post #3 of 4
I read another thread on this forum where people were discussing mouse input lag for competitive gaming.

The comment was that plugging a usb 2.0 mouse into a usb 2.0 port will perform better than plugging into a usb 3.0 port, due to the change of encoding required going from usb2.0 to usb3.0.

So maybe that suggests you can get the full bandwidth of a few usb2 devices plugged into a usb3 hub with multiple ports.

But as @justinjja said, just plug them in and run a few tests.
post #4 of 4
Thread Starter 
I tested this with a Lenovo USB 3.0 dock connected to a Dell XPS 8700.
Under these conditions I am pretty sure USB 2.0 only travels on the USB 2.0 wires.

Transer Speed with 1 usb 3.0 flash drive:
100 MB/s
Transfer Speed with 1 usb 2.0 flash drive:
30MB/s
Transfer Speed with 2 usb 3.0 drives:
100 MB/s each
Transfer Speed with 1 usb 3.0 and 1 usb 2.0
3.0 - 100 MB/s
2.0 - 30 MB/s
Transfer Speed with 2 usb 2.0
15MB/s each
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