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I learnt from this article:

https://www.macrumors.com/2016/10/28/macbook-pro-tb3-reduced-pci-express-bandwidth/

...that the right ports on MacBook Pro 13" 2016 with Touchbar deliver reduced throughput for Thunderbolt devices.

I wonder if this is also the case with the 2017 and 2018 MacBook Pros.

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  • Did the article explain what caused this? Was there contention with other devices or upstream / heat / other concerns? It’s best to bring the details from a link since we tend to keep questions and answers up for longer than many web links live.
    – bmike
    Commented May 26, 2019 at 14:21

1 Answer 1

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Check this information I found on an article:

"The 13-inch MacBook Pro (2017) without Touch bar has 2x full-speed Thunderbolt 3 ports / USB-C ports. The 13-inch MacBook Pro (2018) with Touch ID has 4x Thunderbolt 3 / USB-C ports and, with the 2018 model, all four of those ports are now full bandwidth."

I hope this answers your question.

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  • Great answer, thank you. It doesn't explicitly say if 2017 4 ports has reduced bandwidth on right ports, but it seems to mean it. Commented May 16, 2019 at 21:21
  • To answer to your comment, I found this in an article: "2016 and 2017 models of the 13-inch MacBook Pro with Touch Bar could be configured with sixth- and seventh-generation Intel Core i5 and Core i7 processors, which supported up to 12 PCI Express lanes, limiting full speeds to the two left-side Thunderbolt 3 ports, with reduced bandwidth on the right-side ports."
    – Dakta
    Commented May 16, 2019 at 22:07
  • If my answer was helpful, don't forget to vote for my answer. ;-) Thx.
    – Dakta
    Commented May 17, 2019 at 0:04
  • Of course mate!. Oh! I never voted answers, thanks for letting me know. What would I do without you folks. I sometimes doubt on asking something lest I sound awkward. Commented May 17, 2019 at 6:27
  • Reminder Dakta - it seems odd to answer a question that you don’t also up vote. The only up vote on the question so far is me : ( Thanks to you both - good Q and A - especially if any details from the commends get edited into the body so when comments get deleted, the A and Q have all the details.
    – bmike
    Commented May 26, 2019 at 14:22

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