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The terms 32-bit and 64-bit refer to the way a computer's processor (CPU) handles information. Put simply, a 64-bit operating system such as Windows 7 or Mac OSX 10.6 can handle larger amounts of information than an older 32-bit system. Since it can use more RAM (4 GB and up), a 64-bit computer can be more responsive when you're running lots of programs at once.