Thunderbolt 3 embraces USB Type-C connector, doubles bandwidth to 40Gbps (original) (raw)

At Computex 2015, Intel has unveiled Thunderbolt 3. The headline feature: Thunderbolt 3 has changed its connector from Mini DisplayPort to USB Type-C.

In addition to the new connector, Thunderbolt 3 now also supports USB 3.1 (i.e. Gen 2, up to 10Gbps), and the Thunderbolt transport layer sees its max bandwidth doubled from 20Gbps to 40Gbps (bi-directional, full duplex). Thunderbolt 3 also offers an optional 100W of power, in accordance with the USB Power Delivery spec. Without USB PD, Thunderbolt 3 will provide up to 15 watts.

Thunderbolt 3 is backed by Intel's new Alpine Ridge controller. USB 3.1 support is provided by integrating a USB 3.1 host controller into Alpine Ridge. There will be two flavours of the controller, one that uses four PCIe 3.0 lanes to drive two Thunderbolt ports, and another version that only uses two PCIe lanes connected to a single Thunderbolt port.

With the increase in max bandwidth, Thunderbolt 3 now supports up to two 4K @ 60Hz displays or a single 5K @ 60Hz display running off a single cable. The official Intel slide deck says that Thunderbolt 3 supports DisplayPort 1.2 (not 1.3), but there's no mention of HDMI. The Alpine Ridge leak back in April 2014 suggested that HDMI 2.0 would be supported, but Intel today says that DisplayPort 1.2 is "the native standard" for display over Thunderbolt 3, though HDMI 2.0 monitors will be supported with an "adapter."

The same leak also suggested that Thunderbolt 3 would be paired with Skylake, Intel's next chip after Broadwell, but we can confirm that isn't the case: Thunderbolt 3 would theoretically work with Broadwell. Intel hasn't given an official release date for Thunderbolt 3, but it has told us that it will probably launch alongside Skylake. We asked Apple about its involvement with Thunderbolt 3, and a spokesperson said, "we do not talk about things that may lie ahead." (It wouldn't be surprising if the first outing of Thunderbolt 3 is with a Skylake-powered MacBook Pro in late 2015.)