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Virtually all consumer computers have a limit on the amount of physical memory (RAM) that can be installed. 32-bit systems are typically limited to 4 GB, while 64-bit systems are usually limited by the motherboard, which may support a maximum of 8 GB, 16 GB, 32 GB, or other amount of memory. The operating system may also impose a memory limit; for example, Windows 7 Home Premium does not support more than 16 GB of memory, but Windows 7 Professional, Enterprise, and Ultimate support 192 GB of memory.

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