By default maximum possible USB devices connected is 128. Different motherboards support different numbers. Most of them do not go that high. But how is that number defined? I mean for example x86 CPUs can only recognize up to 4GB of RAM due to 32-bit address length only going up to a specific size therefore maximum number of different memory addresses has cap which is 4GB of RAM while 64-bit addresses are much bigger.
Is there a similar explanation for USB devices? Does that change with USB-3 or does USB-3 only affect speed of connection?
