OSX doesn't support MST daisy chaining monitors. I've got 2 brand new monitors and a decent mac and Apple wont let me use it due to software limitations.

Is there any product I can buy (Amazon preferably) that will let me use my two monitors (not screen mirroring) as I want to? I can plug both displays into the mac but then I can't charge the mac at the same time or close the lid without it going off. Dell U2518D are the displays.

1 Answer 1


If you want more than one monitor, you need to use two different connections, in your case Thunderbolt (Displayport) and some other connection, like HDMI or a dedicated Displayport connection. To do this you need a Thunderbolt 3 dock solution that supports this ability. There are many, such as Elgato, Belkin or CalDigit.

A recent (December 2018) Wirecutter review is a good place to start.

  • It sucks that because Apple can't be bothered adding MST daisychain support I have to spend an extra £200/$300 on something to make my monitors work. OSX is the only thing keeping me with Apple products right now, which is a shame. Thanks for the recommendations though, I appreciate it.
    – john
    Commented Jan 14, 2019 at 16:45
  • 1
    FWIW, I have a CalDigit, and love the convenience of all the ports. I plug in my Thunderbolt cable, and I get external harddrives, a monitor, Ethernet, USB sound all connected. Its even hidden under my desk so no dongletown for me...so there are benefits to that $300 (just a happy customer, not paid endorsement)
    – cmason
    Commented Jan 14, 2019 at 17:00

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