Thunderbolt 3 Ports

Discussion in 'MacBook Pro' started by rukind2, Oct 30, 2016.

  1. rukind2 macrumors newbie

    Joined:
    Jul 8, 2012
    #1
    Thunderbolt 3 Ports on Right Side of 13-Inch MacBook Pro Have Reduced PCI Express Bandwidth. I've seen this mentioned in several threads. Is this true for all 13" versions? If true, why?
     
  2. Idarzoid macrumors 6502

    Joined:
    Mar 15, 2013
    #2
    Not all versions, just the models with touchbar, the touchbarless one doesn't have TB3 ports on right side.
     
  3. Brookzy macrumors 601

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #3
    The 13" uses processors with 12 PCI-e lanes, and Thunderbolt 3 needs four lanes per port for full bandwidth. Hence two run at full speed; four lanes each for eight lanes. The other two have to make do with two each so are slower.

    The 15"s' processors have 16 lanes so can run all four ports at full speed.

    Full discussion here: http://www.macrumors.com/2016/10/28/macbook-pro-tb3-reduced-pci-express-bandwidth/

    I expect a mod will close this thread.
     
  4. rukind2 thread starter macrumors newbie

    Joined:
    Jul 8, 2012
    #4
    Thank you.
     

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