iPad Pro iPad Pro (2018) connection to Mac

Discussion in 'iPad' started by smemma, Aug 7, 2019.

  1. smemma macrumors newbie

    Sep 19, 2016
    I have a 2017 27" iMac that I connect my 2018 iPad Pro to, currently just using a USB C cable. With the iMac only having 2 USB C (TB3) ports, they're at a premium, so I was wondering - will I notice a difference in connection performance if I instead connect it to a Mac using a USB C to USB 3.1 cable?

    I use the iPad Pro as an additional screen using Duet (and will use Sidecar when it's released) so I need performance to be decent...
  2. ericwn macrumors 68030

    Apr 24, 2016
    I think connection performance is roughly the same, charging is probably quicker over USB-C.
  3. AutomaticApple macrumors 68000


    Nov 28, 2018
    I don’t think there’s any difference.
  4. loybond macrumors 6502

    Aug 1, 2010
    The True North, Strong and Free
    If I'm not mistaken, theoretically the USB-A to USB-C cable using USB 3.0 (as I think the USB-A ports are 3.0 on the iMac) maxes out at 5 Gbps, or 625 MB/s. I think the current spec of USB-C cables maxes out at 10 Gbps or 1250 MB/s.

    For something like a hard drive, this does matter. I'm able to get 950+ MB/s read/write speeds from an NVMe drive connected with USB-C. It may not matter as much for Sidecar performance, given that it also works well wirelessly with much less bandwidth available.
  5. smemma thread starter macrumors newbie

    Sep 19, 2016

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