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 is small, both in physical size (it's stored in microchips) and in the amount of data it can hold. It's much smaller than your hard disk. A typical computer may come with 256 million bytes of RAM and a hard disk that can hold 40 billion bytes. RAM comes in the form of "discrete" (meaning separate) microchips and also in the form of modules that plug into holes in the computer's motherboard. These holes connect through a bus or set of electrical paths to the processor. The hard drive, on the other hand, stores data on a magnetized surface that looks like a phonograph record. DIMM (Dual In-line Memory Modules)
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