connect two LG UD 3289-W monitors

I have two connect two LG UD 3289-W monitors, I want to connect both to my MacPro computer.
It does not have UDB-C connection and only one HDMI connection.

I connected one via HDMI and works fine. I tried to use a mini to HDMI connector and plugged it into the thunderbolt port but that did not work. I don't know how to daisychain them since they don't seem to have an output.

Any ideas?
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AleksAsked:
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AleksAuthor Commented:
I got a mini to hdmi and the monitor stays black
How about hdmi splitter?  Would that work or would that just mirror the same in both monitors ?
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Tom CieslikIT EngineerCommented:
If you going to use slitter then you'll see identical screen on both monitors with 2 mouse points. I'm not sure is what you want.
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Tom CieslikIT EngineerCommented:
Double check if your tunderbolt port is activated, go to screen properties and check if you can choose tunderbold as video port with external monitor on it
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AleksAuthor Commented:
I am not sure where to look for that
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Tom CieslikIT EngineerCommented:
Please double check what king thunderbolt port you have


Here you can find some tutorial how to identify your thunderbolt port and how to activate it

https://support.apple.com/en-us/HT204154
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AleksAuthor Commented:
It should support it. I am running windows 10 on the computer but still can't find how to 'activate' the thunderbolt port so it shows on my other screen. I have a miniport to HDMI. So far no luck.
How do I activate the port in win 10  ?
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Tom CieslikIT EngineerCommented:
Windows 10 ?
Thunderbolt port is supported only by Mac OSx
If you want to connect second monitor using mini display port on Windows 10, make sure your port is installed and working.
What kind of computer / video card we're talking about ?
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AleksAuthor Commented:
I got it to work now, but the resolution in the monitor using the thunderbolt is pretty crappy ... Ill try restarting the computer and playing with the AMD software to see if I can get it to look better.
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Tom CieslikIT EngineerCommented:
This is not Thunderbolt. It's 3rd generation display port.
Thunderbolt name is reserved for Mac OSx.

Using display Port is OK to do it, but resolution can be set to maximum video card or monitor setting, so make sure what kind of resolution your monitor is supporting.
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AleksAuthor Commented:
The monitor is 4K, but I can only get 4K resolution in one monitor, the other only displays 1920 resolution. I switched them and same issue, regardless of how they are connected, via mini or the main HDMI, so its not the connection.
Why would one monitor show at lower resolution and only one at 4K ?
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Tom CieslikIT EngineerCommented:
Because of specification of your video card.
Please double check your computer/video card specification but most of Display Ports can handle Full HD maximum.
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AleksAuthor Commented:
I know it can because If I unplug and test both connections the HDMI and then the mini display separate I get full 4K resolution regardless of which connection I am using. The problem is when I have both connected.
It shows only 1920 resolution for one of the monitors, the secondary monitor, regarless which one I choose only one seems to be able to be 4k ... which makes no sense.
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Tom CieslikIT EngineerCommented:
Because as I explained to you before, Display Port can provide only Full HD signal
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AleksAuthor Commented:
So what is the alternative to have 4K on both ?
Plus sounds weird because if I connect display port and only connect one monitor I get 4K
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Tom CieslikIT EngineerCommented:
You need to get video card with 2 parallel same connectors (HDMI for the best)
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AleksAuthor Commented:
This is a Mac computer I cant change components. Running windows on it tho. with bootcamp
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Tom CieslikIT EngineerCommented:
So, there is nothing you can do.
In multiple connection, your video card is supporting only full hd on display port
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AleksAuthor Commented:
Not the case.
If i connect one of the monitors in the HDMI connection I get full 4k. If I disconnect it and connect it to the miniport I also get full 4k.
If I connect both only one of them gets full 4k. Either gets lower res regardless to which port it is connected.

So both ports can give 4k, but only one can when both monitors are connected a the same time. Not sure why.
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Tom CieslikIT EngineerCommented:
To get 4K video on both connections your video car must suport 30Hz refresh rate.
This was available only in new Mac computers since 2015
In older models if you going to use  both connectors, one is supporting 30Hz, then second 15 or 24Hz, but in lower refresh rate 4K resolution is not supported.

https://support.apple.com/en-us/HT206587
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AleksAuthor Commented:
I see ... well ... mine doesn't support more than one at 4k no matter the Hz.
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AleksAuthor Commented:
Unfortunately nothing worked. I ended up connecting them to a newer computer.
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AleksAuthor Commented:
The current computer has a video card that does not support two additional 4K monitors as stated here.
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