What is the maximum memory size supported by win7?

All versions of 32-bit Windows 7 support 4GB of memory, but the actual maximum memory available for 32-bit Windows 7 is only about 3.25GB.

The 64-bit Windows 7 Home Basic Edition can support 8GB of memory, the Home Premium Edition can support 16GB of memory, and the 64-bit Windows 7 Professional, Enterprise, and Ultimate editions can support up to 192GB memory.

Why can’t the 32-bit version of Windows 7 support more than 4GB of memory?

The maximum addressing space of a 32-bit system is 2 to the power of 32 bytes. After calculation, it is 4,294,967,296 bytes, which is what we often call 4096MB. The maximum addressing space of a 32-bit system is 4GB. However, although the system can recognize 4096MB, we still cannot fully use it. This is because there is also memory-mapped input/output (Memory-Mapped Input Output) causing trouble. In addition to the CPU and memory occupying the addressing space in our system, there are also The graphics card also needs to occupy addressing space, which is why the 32-bit system cannot use all the memory. The maximum memory supported by the Windows 7 system is actually only 3.2GB to 3.5GB.

The maximum addressable space of a 64-bit system is 2 to the power of 64 bytes. After calculation, the addressable space reaches an astonishing 16TB (treabytes), or 16384GB. However, in fact, due to various reasons, currently Windows 7 64-bit version can only use a maximum of 192GB of memory.

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