Dual 4K display on a mid 2015 Macbook Pro

Discussion in 'MacBook Pro' started by edjrwinnt, Dec 13, 2016.

  1. edjrwinnt macrumors member

    Joined:
    Mar 8, 2008
    Location:
    North Ridgeville, Ohio
    #1
    I'm looking at getting a mid-2015 Mackbook Pro with the M370X graphics card. I know the specs say it will support two external 3840 by 2160 displays at the same time, but will it support one 3840 x 2160 display and one 4096 x 2160 display at the same time too?
     
  2. ja09 macrumors newbie

    Joined:
    Dec 13, 2016
    #2
    I'm wondering something similar. Are you sure it can power two external 3840x2160 displays at 60hz? I went to the Apple store two days ago with this exact question and their sales and genius person both told me 30hz is max for two external 4k displays on the mid-2015 with or without M370X. Seems like people are running two at 60hz though. I find conflicting info everywhere I look.
     
  3. Sensamic macrumors 68030

    Joined:
    Mar 26, 2010
    #3
    Can the new one 2016 run two 4K monitors at 60hz?
     
  4. ja09 macrumors newbie

    Joined:
    Dec 13, 2016
    #4
    Yes, I'm doing it right now. Working really well for me with two of these DP dongles. Don't even hear the fans kick on unless I'm working with large Photoshop files.

    Thinking about returning the 2016 though because I'm not terribly happy with it, just as long as the 2015 can adequately power these monitors.
     
  5. ja09 macrumors newbie

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    Dec 13, 2016
    #5
  6. maratus macrumors 6502a

    maratus

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    Location:
    Canada
    #6
    2015 can run up to 2x ("1.5x") 4K monitors (one at 60Hz through TB2 and one at 30Hz through HDMI) or two 4K monitors with both at 30Hz through TB2. 2015 doesn't support 5K monitors at all.

    Advanced 4K/5K monitor support is probably the main reason for Apple to go with AMD's new workstation class dGPUs (Pro 450/455/460 line)
     
  7. ja09 macrumors newbie

    Joined:
    Dec 13, 2016
    #7
    Thanks. So frustrating how much conflicting info is out there. Can't even get a straight answer from apple.

    This guy is supposedly running two 4k @ 60hz on a 2014: http://forums.macrumors.com/threads...4k-ips-displays.1816805/page-42#post-21019171

    According to Apple with 5k on the 2015: "Support for up to 5120-by-2880 resolution at 60Hz on a single external display (model with AMD Radeon R9 M370X only)" https://support.apple.com/kb/SP719?locale=en_US
     
  8. maratus, Dec 15, 2016
    Last edited: Dec 15, 2016

    maratus macrumors 6502a

    maratus

    Joined:
    Jun 12, 2009
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    Canada
    #8
    Oh nice, I forgot about M370X model completely :D For some reason I thought that 2015 was with 750M!

    Also notice that it's written "millions of colors" which is 8-bit.

    It's also very interesting to see someone with 2x4K@60Hz on 750M, because I'm sure it was impossible as some point. I think it may be related to 8-bit vs 10-bit, that'd explain inability to add second 4K@60Hz if the first one uses 10-bit

    As you can see, 2016 handles 10-bit at full resolution @ 60Hz
     
  9. fs454 macrumors 65816

    Joined:
    Dec 7, 2007
    Location:
    Los Angeles / Boston
    #9

    I ran two 3840x2160 4K Dell P2715Qmonitors via DisplayPort simultaneously at 60hz on my Late 2013 750M for a year. It works for sure.
     
  10. maratus macrumors 6502a

    maratus

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    Jun 12, 2009
    Location:
    Canada
    #10
    Was it in 8-bit mode?
     
  11. ja09 macrumors newbie

    Joined:
    Dec 13, 2016
    #11
    Wondering about this too. How did your computer handle the monitors during intensive use? Did it run really hot? Ever get choppy?
     

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