I was recently issued a 2017 15' MBP for work, and I want to purchase accessories such that I can hook-up my home workspace to it. I thought I had the situation figured out, but as I hovered on the "checkout" button on amazon, I found a review stating my use case would not work.

The setup:

My home workspace consists of two Dell U2417H monitors. They are each currently hooked up via DP -> Mini DP to my 2015 MBP (personal). They support HDMI.

The ask:

Without making my monitors incompatible with my 2015, I would like to be able to use one USB-C connection on my 2017 to drive both 1080P displays and charge.

The failed idea:

I figured I could use the HDMI ports on my Dell monitors, hook them up to a dongle/dock and be done with it. But I can't seem to find any dongle with two HDMI outs. I found the Dell WD15 had one HDMI and one Mini DP, but evidently even using a HDMI -> mini DP and HDMI -> HDMI connectors I would only be able to mirror the two external displays.

What is the solution here? Two docks/docks seems inevitable. Do you have recommendations?

Thank You,

  • MST exists exactly for this use case, but macOS's drivers still don't support hubs properly (despite the hardware having support; if you boot into Windows it works fine.) My testing setup consisted of a USB-C to Mini DP adapter, this MST hub, and two 27" 2009 iMacs in Target Display Mode. – JMY1000 Dec 8 '17 at 9:05
  • The solution is to use two Thunderbolt ports, there's not enough DisplayPort bandwidth on a single port to drive dual monitors. – Allan Dec 8 '17 at 9:08

You will need an external GPU driven by thunderbolt 3 if you want to output two HDMI signals from one usb-c port. (Something like this https://www.amazon.com/gp/aw/d/B075RTTFDJ/ref=mp_s_a_1_9?ie=UTF8&qid=1512722145&sr=8-9&pi=AC_SX236_SY340_QL65&keywords=external+gpu+thunderbolt+3)

If you just want to have a mirror from one to another, I think you can just use some HDMI doubler but I Donny think you will keep the same image quality (https://www.amazon.com/gp/aw/s/ref=is_s?k=hdmi+doubler)

The best, easiest, and cheaper way to do what you want is just to use two ports as HDMI output on your Mac.

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  • Gotta say, eGPU is a pretty godawful solution :/ – JMY1000 Dec 8 '17 at 8:58

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