Updated

Thunderbolt is optional in USB4, USB4 spec says

The USB-IF is leaving it up to device implementers whether to implement Thunderbolt.
thunderbolt 3 USB4
Intel

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As PCWorld's senior editor, Mark focuses on Microsoft news and chip technology, among other beats. He has formerly written for PCMag, BYTE, Slashdot, eWEEK, and ReadWrite.

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