Trouble with 4k/60 via HDMI on a GTX 1080

[OneInfinteLoop]

Title says it all. I am trying to get 4k (3840 x 2160) / 60 Hz out of my machine that has a GTX 1080 and the latest NVIDIA drivers.

Not sure if this is a config issue on my hackintosh side, the monitor side or both.

I am outputting to a LG 27UD88. According to the manual (attached) I need to enable HDMI ULTRA HD Deep Color to get 60 Hz displayed. When I do that, my screen goes black. When I switch it back, my video returns.

Is there anything I can do on the software side to output to 4k/60 out of my HDMI? I've tried multiple HDMI cables that support HDMI 2.0 so not sure where else to look.

Note: I'm outputting 4k/30 just fine.

 

[Fl0r!an]

OS X doesn't support HDMI 2.0, you'll have to use a DisplayPort connection for 4K@60Hz.

 

[OneInfinteLoop]

Well that explains a whole hell of a lot. Thanks Fl0r!an.

Also: When I use DP, I don't have any audio out Any pointers on that? (It worked via HDMI)