Another form of memory may be hiding in your system. There's memory on the graphics controller. Its main function is to provide higher colour values as you increase output resolution. For example, it takes only 1 MB of graphics memory to produce 24-bit colour (16.7 million shades) at 640 by 480 (640 horizontal picture elements or pixels -- the smallest unit on your screen that the computer can change -- by 480 lines of them). To get that many colours at 800 by 600, you'll need 2 MB of graphics memory and 4 MB to get it at 1024 by 768.
RAM stands for Random Access Memory, commonly referred to as Temporary Memory. Nothing is actually stored here long-term- all storage is done via the hard drive. RAM does store data if your power goes off and is necessary for the computer to process data.
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