Thunderbolt is optional in USB4, USB4 spec says – PCWorld

1. Thunderbolt is optional in USB4, USB4 spec says  PCWorld
2. USB4 development complete, here’s what it means for Mac users  9to5Mac
3. USB4 devices are clear to roll out next year  Engadget
4. New USB4 specs say Thunderbolt is optional for USB4, adding to consumer confusion  Windows Central
5. Speed-doubling USB4 is ready. Now we just have to wait for devices  CNET
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