Determined by "CPU address length". When the size that can be expressed by the CPU address length is much larger than the external memory capacity, the actual capacity of the virtual memory is the sum of the memory and external memory capacity; when the external memory capacity is much larger than the size that the CPU word length can represent, the actual capacity of the virtual memory is The capacity is determined by the CPU word length. In general, the size represented by the CPU address length is larger than the external memory capacity.

The maximum capacity of a computer system's virtual memory is determined by the "CPU address length".

Virtual memory is a technology for computer system memory management. It makes the application think that it has contiguous available memory (a continuous complete address space), but in fact, it is usually divided into multiple physical memory fragments, and some are temporarily stored on external disk storage when needed. data exchange.

The actual capacity of virtual memory is determined by the address length of the CPU and the capacity of external memory. When the address length of the CPU can represent a size that is much larger than the external memory capacity, the actual capacity of virtual memory is the sum of the memory and external memory. The sum of the capacities; when the external memory capacity is much larger than the size that can be represented by the CPU word length, the actual capacity of the virtual memory is determined by the CPU word length.

Generally, the size that the CPU address length can represent is greater than the external memory capacity.

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