LG 5K display w/eGPU? TB3 output?

Discussion in 'MacBook Pro' started by JeffAC, Nov 7, 2016.

  1. JeffAC macrumors newbie

    JeffAC

    Joined:
    Jul 19, 2012
    #1
    I have a new 2.9 Ghz 15" MBP on order, to be delivered some time between the 17th and 25th.

    Taking advantage of the recent discount, I also plan to order one - possibly two - of the 27" LG 5K displays before the end of the year. Ugly bezel aside, I look forward to the screen real estate.

    While this is primarily an iOS development, photography and general purpose machine, I expect to be gaming on it from time to time. I did opt for the Radeon Pro 460 GPU option on the MBP, but I know that it's not especially powerful. For that reason, I am intrigued by idea of using an eGPU solution (ie. AKiTiO Node, Razer Core, etc) with the MBP's Thunderbolt 3 port to drive a beefier GPU either natively in macOS or using Boot Camp/Windows.

    My question is this:

    Right now, as far as I can tell there are NO third party GPUs that output over Thunderbolt 3, so even if I can get the eGPU working with a powerful GPU I don't know if there is any way to hook it up to an LG 5K display (as it only has a Thunderbolt 3 input).

    Is there any way to drive a TB3 display using a commercially-available third party GPU?

    Have there been any announced GPUs that natively output over TB3 and can drive a 5K display (even at reduced resolution)?

    Thanks!
    --- Post Merged, Nov 7, 2016 ---
    Anticipating a couple of responses/questions...

    1. While I may get two of the LG 5K displays, I don't need to power them both for gaming purposes. I'm fine only using one for that purpose and unplugging the other.

    2. I'm also okay with booting into Windows, if needed, using Boot Camp. Not ideal, but livable.

    3. Yes, I could hook the eGPU up to a different / lower-resolution display supporting some other input, but what's the fun in that? The one I have on hand is smaller, has worse image quality and I'd rather stick it in a closet if I could use one of these newer/larger displays instead.
     
  2. Floris macrumors 68020

    Floris

    Joined:
    Sep 7, 2007
    Location:
    Netherlands
    #2
    After looking into eGPU the last week, I have come to the conclusion that unless you use the right Windows version on bootcamp, you won't have such a wonderful experience as some think.
     
  3. JeffAC thread starter macrumors newbie

    JeffAC

    Joined:
    Jul 19, 2012
    #3
    I'm prepared to use Windows via Boot Camp, if need be. It's not ideal but I accept that macOS won't have as good of support for gaming. If improve support in macOS shows up down the road, that's just a nice bonus.

    My main concern is whether or not I can even drive a 5K Thunderbolt 3 monitor with a third party GPU at all, as none of them output TB3 as far as I know.
     
  4. cube macrumors G5

    Joined:
    May 10, 2004
  5. JeffAC thread starter macrumors newbie

    JeffAC

    Joined:
    Jul 19, 2012
    #5
    From my post, above:

    "3. Yes, I could hook the eGPU up to a different / lower-resolution display supporting some other input, but what's the fun in that? The one I have on hand is smaller, has worse image quality and I'd rather stick it in a closet if I could use one of these newer/larger displays instead."

    My goal is to use the third party GPU in question with the LG 5K monitor with TB3 input. I already know that using a different monitor is an option, but that's not what I asked for.

    If anybody else has any thoughts/ideas/etc. that address the question I actually asked, I'd love to hear 'em.
     
  6. cube macrumors G5

    Joined:
    May 10, 2004
    #6
    There are 5K displays with multiple DisplayPort connectors.
     
  7. JeffAC thread starter macrumors newbie

    JeffAC

    Joined:
    Jul 19, 2012
    #7
    I know.

    I'm purchasing the LG 5K display (for various reasons, including its relatively low cost and wide gamut support), which only has a TB3 input.
     
  8. FabioP macrumors newbie

    FabioP

    Joined:
    Nov 24, 2016
    #8
    I am also interested in a eGPU solution using two (LG) 5K displays and a 2016 MacBook Pro. I, too, do not want to invest into another 5K Monitor with a dual DP connection (because when using MacOC the LG 5K Display does integrate more seamlessly).

    I wonder however, whether its not possible to use the added power of the eGPU on the LG (TB3) display without connecting the display directly to the graphics card but into the MacBook. Shouldn't this work? After all, it is possible to drive the internal display with a eGPU on MacOS.
     
  9. theitsage macrumors 6502a

    Joined:
    Aug 28, 2005
    #9
    We recently figured out a way in macOS to feed eGPU acceleration back into the 2016 MacBook Pro's internal display. My guess is this same method would likely work with the LG 5K T3 display in both macOS and Windows.

     
  10. Synchro3, Jan 30, 2017
    Last edited: Jan 30, 2017

    Synchro3 macrumors 65816

    Synchro3

    Joined:
    Jan 12, 2014
    #10
    Buy a DisplayPort 1.2 to USB-C cable. But I doubt 5K will be possible. Max. 4K.

    And there is no GPU with Thunderbolt 3/USB-C, so no eGPU with these ports.
     
  11. samparmenter macrumors 6502

    Joined:
    Sep 19, 2013
    #11
    I assume some GFX cards this year will start to appear with thunderbolt3/usb-c connectors as its about the only clean way of connecting a gfx card to a 5k display.
     
  12. Synchro3, Jan 30, 2017
    Last edited: Jan 30, 2017

    Synchro3 macrumors 65816

    Synchro3

    Joined:
    Jan 12, 2014
    #12
    Thunderbolt 3 is needed for 5K (two DP 1.2 streams). Graphic cards cannot include Thunderbolt nor USB-C. They have only DisplayPort (1.2 or 1.3/1.4), and HDMI.

    But maybe a Dual-Display-Port to USB-C cable would work for 5K. Using two DP from the graphics card connected to the LG 5K-monitor with USB-C (or Pseudo-Thunderbolt). A good Kickstarter-Project.
     
  13. samparmenter macrumors 6502

    Joined:
    Sep 19, 2013
    #13
    Why can't graphics cards have a thunderbolt/usb-c out? What is stopping this?
     
  14. Synchro3, Jan 30, 2017
    Last edited: Jan 30, 2017

    Synchro3 macrumors 65816

    Synchro3

    Joined:
    Jan 12, 2014
    #14
  15. Maven1975 macrumors 6502a

    Joined:
    Aug 24, 2008
    #15

    Im not sure what the issue would be.

    I have a MacBook Pro tb13" with a Razor Core attached. It drives he internal display just fine. This has me believe that I could just hook the 5K display to another port on my MB and use it fine. Unfortunately, I don't have a 5k to test it....
     

Share This Page