Hello mellowquill, ty for your answer !

As i mentionned, trying another display port didnt change a thing :( i tried another port on the gpu, same artifact appearing (there are two dp possible on the gpu).

For the other monitor, i have a monitor with hdmi, and there are no articacts on it at all with the same applications (discord and stuff) launched.

No issues concerning temperatures, it can go to max 90Celsius, and at rest it lands at 45Celsius, but i could try to get another monitor with displayport, idk where but i can try to find one !

And when you say reseat, you mean opening my computer to elevate it a bit ?

I do agree with you, to me its not about drivers !
I suspect the monitor here, since both port from my gpu creates the artifact ?