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.


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 Jan 14 at 16:45
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    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 Jan 14 at 17:00

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