Connecting two USB2 devices to an external USB2/3 HUB, connected to one USB2/3 port would normally limit the average read-speed to 240 Mb/s, and continuing adding devices would limit the average speed to 480Mb/s divided by number of devices.

The same would be if I use a USB controller card on the mainboard of most computers, as they are normally implemented using only one USB channels.

I guess the solution for handling eight devices in full speed is to get USB controller(s) that is implemented using eight dedicated channels to handle the speed of all of the devices.

It does exist an USB controller card that are able to handle full speed of four USB 3.0 devices (PEXUSB3S44V). Four two of these the total would cost about $255 here in Norway. As I do not need the speed of USB 2.0 this price is a bit to much.

Are there any other alternatives that would handle 8 or 2*4 USB 2.0 drives at full speed to a cheaper price than $255?

  • I can't find any with 8 ports that are still being sold. Would one with 7 ports work? Or would 2x4 work? – DJMcMayhem Jan 29 '16 at 19:43
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    @DJMcMayhem, make sure it's actual distinct controllers, and not a single-controller-with-internal-hub card. – Mark Jan 29 '16 at 19:47
  • @DJMcMayhem Both 1x7 and 2x4 should work as long as they have individual channels for each USB2 port. I could use one channel from the mainboard USB controller for the eight device. – Joachim Bratteli Feb 1 '16 at 8:34
  • check this out: amazon.com/OctoFire-Powered-Windows-Charges-Android/dp/… Unfortunately, I don't know if it is available or cost in your country. – cybernard Mar 1 '16 at 4:40
  • I suggest using two or more controller devices to get to your 8 device maximum; this should allow you to save money. For example, you could get one of these: newegg.com/Product/… Much cheaper probably even in Finland due to the lower PCI-E width. Then add one of these: newegg.com/Product/…, which will allow you to add ports if you have an onboard 3.0 header that's going unused. – Adam Wykes Jul 12 '16 at 18:18

OK, finally have a solution

What you do is install this to get 5 ports, then add a cable to out panel adapter to get a full 9 off a single controller.

Speeds may be limited by the controller or the PCI-E 2.0 1x bus, but then again, USB drives usually perform far below theoretical maximums, so you might experience no bottlenecks at all.

Then again, it might also be really expensive in Norway...

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