Do you have any links with information concerning this? I've never been much of a hardware guy and it does interest me a lot at the moment
well the basics are
USB 2.0: 480Mb/s
BUT due to overhead of the protocol and other general ******ness (as it was initially designed for peripherals (keyboard & mouse) and not data transfer) it NEVER achieves this in the real world, and has trouble sustaining high data throughput. it also is quite high latency
FW400 (now mostly) outdated: 400Mb/s
on paper it is slower but it is actually capable of achieving and sustaining the speeds it claims as it was designed for data transfer and is also low latency which is why it is used for high end pro Audio gear like the M-Box Pro
FW800 800Mb/s (this is the more current standard)
all the same as 400 but faster
USB 3.0 5Gb/s
while it was redesigned to be better (less overhead and general ******ness) it is still just an evolution to fill a need from USB trying to do something it had no business doing.
ThunderBolt 10Gb/s 2 ways (20Gb/s total)
minimal overhead and for all intensive purposes it's just PCI-E on an external cable, capable of supporting multiple protocols at once across a single cable, it WILL achieve the speeds it says it will and maintain them, but everything else becomes a bottle neck when things are this fast. it is also low latency (from what I understand even lower then FW)