If you see artifacts during the power-up screens before your operating system loads then you know it has nothing to do with drivers. If you're seeing visual artifacts in just one program then it may be a software problem with that program.
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Overheating is a common cause of artifacts so you should check that any fan on your video card is rotating.
The temperature of your video card depends on what kind of program you are running.
The video RAM on your video card keeps track of many different kinds of data.
If your video RAM is failing then it causes some common kinds of artifacts depending on what kind of data is stored in the bad RAM.
The overclock may work properly at first and then artifacts only start showing up weeks or months later after the chips have been sufficiently damaged.
A lot of hardware must be functioning properly to generate images correctly but there are three main sources of problems: the video RAM on your video card, the GPU which is the main chip on the video card which does the drawing, and the bus interface which transfers data between your video card and your motherboard.Most video cards are relatively cool when you are running 2D programs.The temperature of the video card increases when running 3D programs like games.Underclocking reduces the clock rates of your GPU or video RAM.Reducing clock rates lowers the temperature of the chips and often allows weak ones to work properly.If the screenshot looks fine on another computer but the screen looked bad on your monitor then the problem could either be a problem with your monitor or with the video output circuitry of your video card.