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I have a Mid-2018 Mac Book Pro.

On its 2nd Display Support Option it writes the following

*In addition to simultaneous support of the internal display, this model supports a single external display up to 5120x2880 at 60Hz at over a billion color, up to two displays up to 4096x2304 at 60Hz at millions of colors, or up to two displays up to 3840x2160 at 60Hz at over a billion colors via Thunderbolt 3 (USB-C).

I cannot infer however from the above, whether the particular MacBook can support:

3 external displays with resolution 2560 x 1440

Any interpretations on this?

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I'd say that your MBP is limited to 2 external monitors. You can't sub-divide the same number of pixels across more displays.

  • However I just came across this apple.stackexchange.com/questions/334650/…. This user claims to be able to connect 3 x 4K monitors ...(?) ... and yet with an older macbook pro (2017)...This contradicts the specs themselves – pkaramol Dec 2 '19 at 12:05
  • @pkaramol The specs for the 15 inch MBP 2017 say up to 4 external monitors. 15 inch MBPs tend to have discrete GPUs which provide better function. They also have more ports. – benwiggy Dec 2 '19 at 12:58

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