artifacts and slight image clipping

Hello :) I have 2 problems after changing my computer 1) After upgrading my graphics card to a newer 5070 RTX series model, I'm seeing artifacts at low resolutions (~720p). I reinstalled the drivers using DDU, but that didn't help. I only have the problem with Firefox - I tried another browser, and it doesn't have the same issue. (screen image) 2) This problem is more complicated. When watching videos on YouTube, Netflix, or other sites, I experience slight image stuttering, as if Firefox is chopping frames (the sound continues), but a small amount of image stuttering appears. I reinstalled the system and replaced the motherboard with a Z790 MSI. When I play the video locally on my computer, there's no problem. I play it in Chrome or Edge, but I can't see it. In Firefox, the video stutters slightly, about 0.5/1 second. YouTube stats show that I'm dropping frames at random times; sometimes it's 2 frames per 20,000, and sometimes it's 150 frames per 7,500. I reinstalled the system twice, the drivers are up to date, and the software is also up to date. And I still get the error. I don't know how to fix it. PLZ NEED HELP ME :))