Thunderbolt 3 Ports

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

  1. rukind2 macrumors member

    Jul 8, 2012
    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. 0983275 Suspended

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


    May 30, 2010
    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:

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

    Jul 8, 2012
    Thank you.

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3 October 30, 2016