Green dots flickering all over my monitor

Take a screenshot while it's happening and look at it on your phone. If the dots are in the screenshot it's the GPU or driver. If the screenshot is clean, it's the cable or the monitor. Nine times out of ten green sparkles like that are a DisplayPort or HDMI cable that can't quite handle the refresh rate, so swap the cable or drop the refresh rate a step and see if they go away. Try a different port on the card too. If a different cable at a lower refresh still does it, then start worrying about the panel.