Which GFX Card MBP 2016

Discussion in 'MacBook Pro' started by urbZZ, Nov 24, 2016.

  1. urbZZ, Nov 24, 2016
    Last edited: Nov 25, 2016

    urbZZ macrumors newbie

    Sep 1, 2016
    I have blindly ordered the Radeon 460 with my 15' MBP, not really knowing if I would need it.

    Now I have learned, that the 460 won't be used in "Desktop Mode". So i started wondering:

    1) Under what circumstances does the OS decide to switch to using the Radeon instead of the built in HD Grafics? What is the exact trigger? How is this implemented?
    2) Does it make a difference if the MB is being charged?
    3) If an external 4/5K Display is connected, Radeon is used always?

    If the Radeon is only used when gaming, i will have no use for it ...
  2. leman macrumors G3

    Oct 14, 2008
    OS X switches to a higher-performance GPU if an application is using 3D or compute APIs (OpenGL/Metal/OpenCL) or explicitly requests the higher-performance GPU. The actual rules are a bit more complicated, but this is the basic idea.

    Arstechnica has a nice little description of this: http://arstechnica.com/apple/2010/04/inside-apples-automatic-gpu-switching/

    I don't think so, but when low on battery the system might be less eager to activate the dGPU

    Yes, because external video output is wired via the dGPU

    It will also be used for video editing and stuff like that in most contemporary apps.
  3. urbZZ thread starter macrumors newbie

    Sep 1, 2016
    Thanks, exactly what I needed to know !
  4. monkeydax macrumors 6502

    Nov 2, 2012
    I guess it also really depends on whether you do anything else that may need the graphics card. But to be honest, if you don't actually know which applications would need it, you probably don't use many applications that rely heavily on it.

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