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?