Flickering problem on my new hackintosh

Hi,
I have recently built my first hackintosh, everything is fine without the flickering problem.

Configuration:
Monitor : ASUS PG279Q 1440p
Mobo: GIGABYTE Z170X Gaming 7
CPU: Skylake 6700K
RAM : G.Skill Trident Z 2x16GB
SSD: Samsung 850 EVO 250 GB

I do not have any graphics card for now. Is it because of the Intel HD 530 GPU came with the CPU ?