I just got the Samsung G9 Neo. I have it plugged into the Display Port 1.4 cable that came with it. It's plugged into an RX 5700 XT
Which is DisplayPort 1.4 with DSC 1.2a. With 120hz AND FreeSync Premium Pro on I do not have any issues. Monitor looks amazing. If I switch to 240hz, or disable Freesync Premium at any hz settings the display's picture has this lines. It's very hard to capture with a picture: Imgur: The magic of the Internet Second picture shows the lines if you look at the Edge icon.
What I would like to know is what is going on here? Is this how the monitor is? Is this called scan lines or another issue? Samsungs web site reports scan lines in an image as gray vertical bars but that isn't it. They look like very faint lines lines like the pixel row is lowered or off.
This is known as "scanlines issue" and all 240hz Samsung monitors are plagued with it. You can search it in the internet and you will see tones of reports. There is no single unit not having this issue.
At 240Hz or at 120Hz VRR enabled you will have it on desktop environment. On games there is no scanlines problem on 240hz or VRR, idk why.
They will only get worse over time, mine started as only a small issue, now i have a monitor that only half works after only a couple years, i would try to send it back if i were you
Games have the issue for me, Fortnite is particularly bad on any shade of blue. Mixed colors are less bad. Turning off vrr and setting 120Hz is the only acceptable combo of settings on my build.