A video card (also known as graphics card) is an expansion card whose function is to generate and output images to a disp7. Some video cards offer added functions, such as video capture, TV tuner adapter to connect multiple monitors, and others. Most video cards all share similar components. They include a graphics processing unit (GPU) which is a dedicated microprocessor optimized for 3D rendering. It also includes a video BIOS that contains the basic program that governs the video card's operating and provides the instructions that allow the computer and software to interface with the card. If the video card is integrated in the motherboard, it may use the computer RAM memory. If it is not it will have it's own video memory called Video RAM. This kind of memory can range from 128MB to 2GB. A video card also has a RAMDAC (Random Access Memory Digital-to-Analog Converter) which takes responsibility for turning the digital signals produced by the computer processor into an analog signal which can be understood by the computer display. Lastly, they all have outputs such as an rfD-15 connector [standard monitor cable ], DVI connector, S-Video , composite video or components video.
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