video ram

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Daemon Poster
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ok, i think i have asked this question somewhere before, but i never really got an answer. what exactly is video ram? like on my video card, i have 256 mb of video ram. what does it do?? kind of a noobish question, but im confused.
 
In a nutshell, the video ram sends two streams of data, one to refresh and update the image being shown, and the other to communicate with the CPU and change data about the image. :D
 
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