What the Thunderbolt Badge Actually Buys You

USB-C is a connector shape, not a capability. Two identical-looking ports can differ enormously: one may carry nothing but 5Gbps data and a trickle of power, the other tunnels PCIe, drives two 4K monitors and charges the machine. Thunderbolt certification is what turns those abilities from optional extras into guaranteed minimums, which is the whole reason the badge is worth paying for.

Thunderbolt 4 fixed the link at 40Gbps. Thunderbolt 5 lifts it to 80Gbps in both directions, with an asymmetric mode reaching 120Gbps towards a display, and it is built on USB4 version 2, DisplayPort 2.1 and PCIe Gen 4 tunnelling. Which generation you need depends less on marketing numbers than on what you plan to hang off the port, so work through the decision factors below before choosing.