HKC NB27C2-DP 144hz FREESYNC MONITOR FLICKER

[loybie06]

Hi guys, i just recently bought my first PC unit with a 27in monitor with FREESYNC 144HZ, but i don't know why it keeps flickering when i set the refresh rate to 144hz, while a little flicker on 120hz and no flicker on 60hz. I am using displayport included in the box. My drivers are all updated to latest.

BOARD B450 AORUS PRO
PROC RYZEN 5 3600
GPU 1660TI VENTUS XS

i am hoping someone can help me fix my unit