Intel details Thunderbolt 4 spec, but 'Apple silicon' support is unclear [u]

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Intel on Wednesday announced new details about its upcoming Thunderbolt 4 standard, though compatibility with Apple silicon Macs remains to be seen.

The Thunderbolt 4 standard will be backward compatible with previous Intel ports and cables, and will also be cross-compatible with USB4. Compared to Thunderbolt 3, it'll offer a number of tangible benefits to consumers while retaining the USB-C connector type.

For example, it'll allow for universal cables up to two meters long without needing to resort to active cables that leave out older USB standards. Thunderbolt 4 will also support accessories, such as docks, with up to four Thunderbolt 4 ports. The standard will double the minimum video and data requirements of Thunderbolt 3.

Other features include the ability to wake up a computer from sleep by touching a peripheral connected to a Thunderbolt dock, and protection against physical DMA attacks.

Thunderbolt 4 will debut on Intel's Tiger Lake Processors for laptops later in 2020. Intel will also make new 8000-series controller chips available to computer and accessory makers.

How Apple silicon Macs are going to implement Thunderbolt support is an open question. The Developer Transition Kit — essentially a Mac mini with an A12Z — doesn't come with any Thunderbolt 3 ports, for example.

Intel notes that Thunderbolt 4 requires "Intel VT-d-based direct memory access protection." That suggests that Thunderbolt 4 may require Intel chips or technology to function.

Update: Apple in a statement to AppleInsider said it is committed to the future of Thunderbolt and will support the protocol on Apple silicon Macs.