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4k monitor - can't select 4K resolution

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4k monitor (Samsung U28D590D) - can't select 4K resolution

Hello people!

I recently upgraded my CustoMac from Yosemite to El Capitan. Although the installation went flawless, there is just one thing I can't get to work. And that is my 4k monitor. While on Yosemite I was able to select 3840 x 2160 from the dropdown menu, in El Capitan, the highest resolution I can select is 2560 x 1440.

Hope someone has got an idea on what to do so I can start enjoying my monitor to its fullest :).

The system seems to recognise both my monitor and graphics card. The monitor is connected using display port.
See the screenshot more specs! Any thoughts re appreciated, thanks!
The model of the monitor is: http://www.samsung.com/us/computer/monitors/LU28D590DS/ZA

Screen Shot 2015-12-02 at 16.17.12.png
 
Make sure you have set DisplayPort Version to 1.2 in menu -> settings on your monitor, I have the same monitor connected via DP and I can set 3840x2160 or a number of HiDPI resolutions..
 
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