USB4 v2 and Thunderbolt 5 in 2026: what works today, what doesn’t, and how to pick cables, docks, and systems without mistakes
September 2026. We review what USB4 v2 (80/120 Gb/s) and Thunderbolt 5 actually promise, what is truly certified and on sale, how to read cable logos and fine print, which limits each video link (DP 2.1/2.1a, UHBR) imposes, and how to verify the negotiated speed in Windows and macOS before you buy.