About Thunderbolt 3 is an I/O technology that connects devices to your computer at speeds up to 40 Gbps. Thunderbolt 3 combines data transfer, video output, and charging capabilities in a single, compact connector. It offers faster speeds than Thunderbolt 2—up to 40Gbps with a Thunderbolt 3-compatible cable. Thunderbolt 3 also supports USB 3.1 Gen 2 connectivity at up to 10 Gbps. Thunderbolt 3 uses USB-C connectors at each end of the cable. They look like this: These Mac models have Thunderbolt 3 (USB-C) ports: • MacBook Pro (2016 and later) • iMac (2017). About Thunderbolt 2 Thunderbolt 2 is the second generation of the port technology. Thunderbolt and Thunderbolt 2 port connectors look the same, but Thunderbolt 2 provides more speed—up to 20 Gbps. Thunderbolt 2 is backwards-compatible, so you can use Thunderbolt 2 devices with an older Thunderbolt port (unless otherwise documented by the device's manufacturer). And you can use an older Thunderbolt device with a Thunderbolt 2 port. All Thunderbolt cables work with Thunderbolt 2 and older ports and devices. ![]() ![]() ![]() ![]()
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May 2018
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