Can you upgrade older computers with add-on cards ... And note that neither Thunderbolt 4 or 5 are compatible with older Thunderbolt 2. How about 6GBps sequential reading, and nearly 4GBps ...
That may be true, but Kensington’s Thunderbolt 5 cable was labeled appropriately and this should be certified. And why should I need to buy an Apple cable to get my PC docking station to work?