Sonnet still saying TB3 for the developer kit and TB2 for Mac compatibility (non developer kit):
https://www.sonnettech.com/product/egfx-breakaway-box.html
Still not really sure why three versions of the breakway box are needed. Once this exits beta, hope additional boxes (and manufacturers) are fully supported. The GPU-350W-TB3DEK seems to somehow be different than two other models (GPU-350W-TB3Z and GPU-550W-TB3), especially with power limitations. Seems that they are working on power issues with the beta and TB1/TB2 have limitations they cannot work around.
From Sonnet FAQs:
Every Thunderbolt 3 Macbook Pro will accept Power Distribution, up to 60W for the 13" and up to Thunderbolt 1 and Thunderbolt 2 computers will not accept Power Distribution.
They are also noting this requirement now:
The only configuration to have official plug-and-play beta support with macOS High Sierra 10.13.3 is a Thunderbolt 3 Mac connected to the Sonnet Breakaway Box Developer Edition, which is bundled with Sapphire Radeon PULSE RX 580 8GB card. High Sierra support for the Developer Edition will be beta until spring 2018. Because it is currently beta there are some temporary limitations. For example, the external graphics card currently accelerates only external displays connected to the graphics card. Note that you will not be able to obtain support from Apple or AMD for external graphics under macOS at this time. If you have any issues using any Sonnet product, please contact Sonnet customer service at
support@sonnettech.com.
If you are trying to use any other Breakaway product configuration, please contact Sonnet customer service at
support@sonnettech.com.
If you are trying to use a Mac equipped with Thunderbolt 2 or Thunderbolt with any Breakaway product, please contact Sonnet customer service at support@sonnettech.com.