Next-gen Thunderbolt doubles speeds but changes the connector | Ars Technica

Leaked slide shows Intel iterating rapidly, which is a good and bad thing.

Enlarge / The leaked slide that purports to out the next-generation Thunderbolt controller.
VR-Zone

Thunderbolt 2 just started showing up in devices late last year, but a new slide leaked by VR-Zone is giving us our first glimpse at what the next version is going to look like. Dubbed "Alpine Ridge," the new Thunderbolt controllers will double Thunderbolt 2’s bandwidth from 20Gbps to 40Gbps, will reportedly support PCI Express 3.0, and will reduce power usage by 50 percent compared to current controllers. The downside is that the new version will require the use of a new connector—it supports charging for devices that use up to 100W of power and it’s 3 mm shorter than current connectors, but adapters will be required to maintain compatibility with older Thunderbolt accessories.

Further Reading

Sequel to Thunderbolt is all about 4K video

Creatively named Thunderbolt 2 uses 2x20Gbps lanes to drive giant displays.

Doubling the available bandwidth will enable next-generation Thunderbolt controllers to drive two 4K displays simultaneously, where current controllers can only drive one. The new controllers will allegedly be compatible with a variety of other protocols as well, including DisplayPort 1.2, USB 3.0, and HDMI 2.0. Intel will offer two different versions of the controller—a version that uses four PCI Express lanes to drive two Thunderbolt ports and an "LP" (presumably "Low Power") version that uses two PCI Express lanes to drive one port. This is consistent with the current controllers. High-end devices like the Mac Pro and Retina MacBook Pro use two-port controllers, while lower-end, lower-power devices like the Mac Mini and MacBook Air use the one-port version.

Thunderbolt 2 gave the specification a performance boost but didn’t change all that much about the protocol. It combined the original Thunderbolt’s 10Gbps channels to allow for higher maximum speeds, but it didn’t increase the total amount of bandwidth available or introduce any new protocols. The upside is that it maintained full compatibility with all of the original Thunderbolt cables and accessories, something that this next-generation Thunderbolt controller won’t be able to do without adapters (though to be fair, USB 3.1 and the new Type-C USB connector have the same problem).

Enlarge / There are many benefits to the new USB Type-C connector, but it will require adapters to interface with the years-old Type-A ports.
USB-IF

We don’t know anything about timing for sure since this is just a leak (and thus subject to change), but the slide mentions the "Skylake" CPU architecture. Skylake is the successor to Broadwell, which should be launching later this year—if Intel holds to its standard release calendar, that means we won’t be seeing next-generation Thunderbolt controllers until 2015 or so. According to VR-Zone, Broadwell will only get an updated Thunderbolt 2 controller that will reduce power consumption and add support for charging devices that need up to 53W of power, about half of the 100W that the Alpine Ridge controller can supply. That same post also outed the existence of the just-announced Thunderbolt Ethernet, so VR-Zone appears to be a reasonably reliable source of information on the topic.

In some ways, it’s good to see that Intel is so committed to ramping up Thunderbolt speeds—the company promised maximum speeds of 100Gbps when it introduced the specification, and we’re approaching that number fairly rapidly. Alpine Ridge widens the performance gap between Thunderbolt and USB 3.0 and 3.1 while adding desirable features like improved 4K support. On the other hand, changing the connector just four years after the initial release of Thunderbolt (and two-ish years after the release of Thunderbolt 2) won’t do anything to help the specification’s already lackluster adoption, especially if the adapters are expensive. Hopefully this new connector will be able to carry the technology all the way to the promised 100Gbps, but there are obviously no guarantees.

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Andrew Cunningham / Andrew has a B.A. in Classics from Kenyon College and has over five years of experience in IT. His work has appeared on Charge Shot!!! and AnandTech.

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