[MST1407]

Hello WarlordMegatron,

Sorry to hear this.
If it worked before and without anything changes it all of sudden does not work anymore, then there is a chance that the Cable Adpater is indeed defective.
Please check if there have been Updates and if yes please try loading a restore point form before those the problem started.
IF that does not help please claim warrantyy from the place of purchase, so it can be chaged for a new cable. 

[MST1407]

I will have supprot to send you an email today

[MST1407]

The only thing i can think of is that the Mac Mini is not able to read the EDID info coming from the screen at boot in a proper mannery, and therefor offers a signal that the Screen does not understand/support.
You have a windows machine you can use to Update firmware for the Adapter ?
Or a bootcamp machine ? I mean we have recently got new firmware for the adapter, but that updater program does not work on MAC Os 🙁
I am not sure if that will solve the issue, but it is worth the try i would say,

[MST1407]

yes indeed, 4k 30 Hz should work.
Non of the tips of “this guy” was helpfull for you ?

[MST1407]

It should certainly work on the R9 280X … sounds like a software issue to me.
Did you try with a clean driver installation ?

• AMD Drivers

Especially when using the upgrade feature to update drivers can give issues, because old files can remain in the registry of windows and can be “in the way”. Please make a new clean driver installation to make sure that part is ok. I know AMD made many driver updates after that, however most aimed at RX400 series only. I do hear end-users with R9 200/300 series Cards reporting that from 16.12.2 (or later) also works quite decent for them. Please uninstall the current Graphics driver and all related Graphics software like Afterburner/GPU-Z or whatever graphics related software you might have installed. Best way to remove Driver Software is to boot Windows in Safe mode, so the registry can also be cleaned. When you system does not allow you to do that, you can also use a program like DDU to remove such software: http://www.wagnardmobile.com/DDU/  

Reboot and manually download and install 16.8.3 graphics driver (don’t let auto installer from Windows do that)  You can find here:  http://support.amd.com/en-us/download/desktop/previous/detail?os=Windows%2010%20-%2064&rev=16.8.3
or
a newer version if you prefer … but please do not use any driver from 16.9.1 ~ 16.12.1; here you can find listing of drivers … http://support.amd.com/en-us/download/desktop/previous?os=Windows%2010%20-%2064

After this, 
First connect 1 TV, set the Resolution to 1080p 60Hz in windows. Then connect second one and do the same. 

Yes you can still use Eyefinity while using the CAC-1070 / CAC-1170 Adapters.
To connect 4 x 4K TV to 1 system in 4K resoltuion will require you to have access to 4 x DisplayPort 1.2 ouputs. So you will need 2 x R9 280X for instance and i would adivise use od 4 x CAC-1170 to convert to HDMI2.0

I will ask Support to send you firmware file by “we tranfer”, you don’t need an account for that.

[MST1407]

very welcome

[MST1407]

Please claim warranty from where you bought the product,  i am quite sure yours is defective. Very sorry for the inconvenience.

[MST1407]

it should not get hotter than about 40 degrees celcius (45 max).

[MST1407]

that gives some extra setting for multi monitor purpose, can be handy when using more External USB Graphics Adapters.

[MST1407]

I would advise you to use a CAC-1507 = USB Type C to Displayport 1.2.
No need to convert the signal this way … and your screen has a DP input.
It should also work with the CAC-1504 though.
Did you already try making a Custom Resolution for 1920x1080p 60Hz timing standard at “Auto” ?

[MST1407]

To make sure i understand correctly; your system sees the screens but does not allow you to use extended mode ?

[MST1407]

and what screen / tv do you have ?

[MST1407]

Hi Phantom,

It couls still be different Intel i5 CPU’s but the highest spec one i could find is the Intel i5-4308U with Iris 5100 graphics and that does max resultion of 3200×2000 60Hz over the DP output, so no support for 4K unfortunately 🙁

[MST1407]

Hello WSB,
Sorry for the delay. We have had some bank holidays here.

It sounds to me you are trying to get 2 x 4K 60Hz screens runnning of a single DP 1.2 ouput. That will not fit. An MST Hub is a handy tool to connect more screens to a single DP1.2 output, but it does not increase the bandwidth of the DP ouput.

Each Displayport 1.2 ouput has enough bandwidth for:
1 x 3840x2160P 60Hz
2 x 2560x1600p 60Hz + 1 x 1920x10880p 60Hz

If you want to connect two 4K screens to a R9 280X i would advise this:
2 x CAC-1170 = Active Mini Displayport 1.2 to HDMI 2.0 Adapter
http://www.club-3d.com/index.php/products/reader.en/product/mini-displayport-12-to-hdmi-20-uhd-active-adapter.html

[MST1407]

ok keep me posted please

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