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Computers have 6 different amounts of mega-bytes. The first is 128, then 256, then 384, then 512, then 640, then 1024. The most common are 128, 256, 512, and sometimes, 1024. The higher the number, the better.
Computers also have different speeds. If a computer has less than 600 MHZ, do not buy it. It will probably be too slow! The fastest there are on regular computers are 3.0 GHZ. You see, once you get to 1000 MHZ, you have 1.0 GHZ. As you can see, 3.0 GHZ, is very fast!
Also, a GB(giga-byte) is the internal memory, or how much the computer can hold in files or storage. 1 GB is equal to about a thousand MB.
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