Apple usb-c to HDMI seems to support 3840x2160@60

Discussion in 'Mac Accessories' started by stormxu, Jul 9, 2017.

  1. stormxu macrumors newbie

    stormxu

    Joined:
    Jul 6, 2017
    Location:
    Champaign, IL
    #1
    Just notice the updated instruction at https://support.apple.com/en-us/HT206587

    says:

    "With macOS 10.12 or later, MacBook (2015 and later) and MacBook Pro (2016 and later) support these resolutions and refresh rates over HDMI 1.4b using the USB-C Digital AV Multiport Adapter:

    • 4096x2304 at 48Hz refresh rate
    • 3840x2160 at 60Hz refresh rate (mirroring is not supported at this resolution)
    "

    Can anyone confirm this? Also what is the usb-A speed then? I am planing to buy a 3840x2160 monitor for my non-tb MacBook Pro 2017. If apple's dongle can support this, It would be great (no need to use a port to dp)
     
  2. campyguy macrumors 68030

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #2
    HDMI 1.4 does not support UHD @60Hz. Apple's adapter is a passive adapter.

    Consider an active adapter, one that supports HDMI 2.0 and, therefore up to UHD @60Hz. Accell Cables makes active adapters for both the mDP and USB-C port configurations to HDMI 2.0a.
     
  3. MrX8503 macrumors 68000

    Joined:
    Sep 19, 2010
    #3
    That will not support 4K @ 60hz.

    The problem is bandwidth. You won't find any multi adapters (that I know of) that will support 4K @ 60Hz unless it's TB3.
     
  4. campyguy macrumors 68030

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #4
    TB3 carries DP 1.2, just like the MBPs all do going back years. DP 1.2 conveys plenty of relevant throughput/bandwidth for UHD @60Hz with the correct adapter. Like I wrote in my OP, Accell makes a mDP>HDMI 2.0 adapter that handles 4k @60Hz - I've got several in my offices for our displays waiting for Kaby Lake PCs and Macs…

    Specifically, this adapter, under $40 - QED:
    https://www.accellcables.com/products/mini-displayport-1-2-to-hdmi-2-0-adapter
    Accell makes other adapters like this with different input interfaces, and their products are on the DisplayPort.org product portal unlike most of the junk out there. And, Apple's cables/adapters haven't gone through the certification process - Accell's relevant products have. Cheers.
     

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