- Jun 1, 2017
Thunderbolt 4 is essentially USB 4 with all featured enabled and all specs maxed out. So 20Gbps can be USB 4, but only 40Gbps can be Thunderbolt 4 etc.Well since USB4 is heavily based on TB3, no wonder.
To be confirmed but what I understood is any PC compatible with USB4 is compatible with TB3 AND compatible with USB 3.x and USB 2. USB 1(1.1) though is unkwown (unspecced ?)
That being said lower end devices will be 20Gbps, better oines will be 40Gbps and cables will cost an arm and a leg.