But I do not need hdmi from the board, but with graphics.
Do not know of anyone running graphics successfully without a motherboard.
No HDEF, no OS X audio.
See Realtek ALC AppleHDA Audio Injection, use Patch/Rename dsd/AZAL/Audio ID: 1
For onboard audio, see Yosemite: Audio - Realtek ALC AppleHDA, use 1. realtekALC/patch in place
For HDMI audio, see Post #1, use 5series guide.