Originally Posted by EniGma1987
Thunderbolt 3 already does 40gb and uses a type-C interface. So what does this do that warrants a name change?
Thunderbolt is using PCIE 4x 3.0 and DP data-streaming in order to achieve 40gb/s.
Meaning it can give 32gb/s on PCIE or 20gb/s on DP 1.2, or a combination of part of each. But not every device support the mixture, so a pure PCIE connecting hardware (like a eGPU) will be basically limited to 32gb/s.
Thunderbolt 4 will use PCIE 4.0, which means you can get pure PCIE hardware running at 40gb/s without needing to run specialized firmware or intel specific thunderbolt chips to get it to work.
It will also support USB 4 running at 40gb/s data, higher watt and amps, better data security etc.
So it is not just a name change. There are good reason to switch for it over TB3 even if they have the same data rate on paper.
I also hope it will support DP 2.0, but that is a bit of a long shot, as intel and apple wants to make TB the standard over DP.