4k but only 30Hz / no sound from DP

Hi,

System specs: MSI Z97I Gaming AC / i7 4790k / iGPU (HD4600) / screen connected on Display Port

I made a Vanilla install yesterday by using the video guide from "Morgonaut". But ,there are still two things I can't get working.

1) I can't select 60Hz for my 4k screen. I get only a 30Hz and below option. Also, when I go to the scale option of the screen, behind the different resolutions there is the info "(low resolution)". At first, I wasn't even able to get 4k resolution, but with a patch (framebuffer4K) of the config.plist I got it working. And to get 60Hz I also used an other patch (CsrActiveConfig), but this patch it didn't help. (Both patches are visible here: https://www.reddit.com/r/hackintosh/comments/3zt8ti/4k_uhd_with_hd_4600_displayport/). Does anyone have an idea what to try next?

2) I'm not able to get the sound to my screen speakers with Display Port. I tried two different kexts for this (VoodooHDA and AppleHDA). Is this even possible? I could not find any info about someone using sound over Display Port.

Thank you in advance!