No 4k: i7-4770s/HD4600 -> ASUS Z97-A -> DP -> mDP -> DELL P2415Q, Mac OS 10.10.4

Hi all,


with the above configuration, all i get is 2560x1440 @ 60 Hz, no 3840x2160.


MST is set to “Off” at the Monitor.


According to the specs, 3840x2160 should be possible:


Integrated graphics processor - Intel® HD Graphics support
Multi-VGA output support: DisplayPort / HDMI / DVI-D / VGA ports
- Supports DisplayPort 1.2* with max resolution of 4096 x 2160 @ 24 Hz / 3840 x 2160 @ 60 Hz
- Supports HDMI with max. resolution of 4096 x 2160 @ 24 Hz or 2560 x 1600 @ 60 Hz
- Supports DVI-D with max. resolution of 1920 x 1200 @ 60 Hz - Supports RGB with max. resolution of 1920 x 1200 @ 60 Hz - Supports up to three displays simultaneously


Could it be a pixel clock limitation?
2560x1440 @ 60 Hz yields 221 MPixel / sec. This should at least yield 24 Hz @ 3840x2160 which i think i could settle with. I there a limitation in Mac OS?


Any ideas?

Apple only use Intel CPU graphics at 60Hz. To get a 4k monitor running at 24Hz is painful - a 30Hz refresh rate would require a graphics card with a displayPort connection like a GT 750.

To get 4k resolution @60Hz a GTX 960 is advised. New AMD 380 card would be another consideration.

See this thread for more information:
http://www.tonymacx86.com/buying-advice/152255-graphic-card-options-4k-monitor.html

Thank you for the quick reply, the helpful hints and the link. Very much appreciated!

-Heinrich

Success: I bought a "ZOTAC Geforce GTX 750 Zone Edition" (fanless!) which after installing the Nvidia web drivers according to Stork's guide works perfectly! I cannot say anything about performance, but it is totally ok for be. I am no gamer and i prefer quiet systems.

-Heinrich

Welcome to hackintoshing!