Artifacts can be caused by excessive overclocking, heat, and even dust buildup.
Strange artifacts: Similar to screen glitches, a bad graphics card can result in strange artifacts all over your screen. Screen glitches: If you’re playing a game or watching a movie and suddenly start seeing tearing or weird colors appearing all over the screen, your graphics card might be dying. If you get stuttering along with other warning signs, there’s a good chance it’s your graphics card. 
However, malware, a dying hard drive, and even RAM problems can all cause the same kind of behavior, so don’t jump to conclusions.
Stuttering: When a graphics card starts going bad, you might see visual stuttering/freezing on the screen. Here are some early warning signs of video card failure.
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