What are the green squares on the monitor?

Look for a problem in the video card

This is a dump.

Artifacts are called. You either overclocked the video card too much, or it is already coming to an end

The video card is dying ...

Press F vidyuhe

If artifacts appear and games do not crash, then there may be memory problems, but here is a grid of artifacts and most likely a GPU blade, what kind of video card?

By the way, a couple of posts below was a question about broken pixels and there were red dots on the pictures that looked like artifacts, and so the reason was that the cable sits badly. Try to check the cable first