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[SUCCESS]4K @60Hz enabled on Dell P2415Q with Retina resolution

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I have the same monitor and cannot get 4K@60Hz on 10.11.3 with Nvidia Web drivers.

Screen Shot 2016-02-05 at 10.25.44.png

3008 x 1692 @60Hz is maximum available for me with Nvidia 760GTX 2GB

System does detect it as 4K monitor with 3840x2160
Screen Shot 2016-02-05 at 10.30.00.png

Is anyone actually running 3840x2160@60Hz with this monitor?
 
10.11.3 - MacPro
Rampage IV Gene |  i7 4930K |  GeForce GTX 760
10.11.3 - MacPro
Rampage IV Gene |  i7 4930K |  GeForce GTX 760

Not sure if this is relevant to your GPU, on my system 4K@60Hz is currently enabled by CsmVideoDxe-64.efi (installed by Clover) right from the boot screen
 
CsmVideoDxe-64.efi is just for Clover GUI i think. Installed the driver no different so I removed it.

I can get 4K@60Hz now, not sure what i did.

Only new app is Kodi, I installed Kodi and set it @4K and now 4K res is available on 'Display' settings

Screen Shot 2016-02-10 at 15.58.40.png

Previously max res was 3008x1692 but at 4K everything is tiny and not readable still good its works now so 4k movies can play at native res.
 
10.11.3 - MacPro
Rampage IV Gene |  i7 4930K |  GeForce GTX 760
Did you get the 4GB version on purpose for powering the 4K - would 2GB version would be equally capable of powering a single 4K Display?
 
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