How much memory does xp support

How much memory is supported depends on the number of bits of the operating system, whether it is 32-bit or 64-bit: the 32-bit XP system only supports 3.25G physical memory, and the system will not recognize more. The 64-bit system can use up to 128G. of physical memory and 16TB of virtual memory.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

WinXP system memory introduction

How much memory is supported depends on the number of bits of the operating system. Depends on whether it is 32-bit or 64-bit.

32-bit systems can support 3.25G (except Win2003), which means that if you install 4G memory, you can only display 3.25G memory. 64-bit systems can support 128G (XP also has a 64-bit version, but most of them are 32-bit. It is said that 64-bit XP does not have an official Chinese version). However, Win7 and VISTA 32-bit systems can be modified to enable PAE support to 128G, which is the same as Win2003.

Theoretically, 32-bit = 2^32B = 4 * 2^30B = 4GB, so a 32-bit operating system can access addresses in the 4GB range.

In practice, I have never seen any 32bit WinXP able to access 4GB of physical memory.

Theory and practice seem to be contradictory, but they are not. Note that "can access addresses in the 4GB range" does not mean "can support 4GB memory"!

Detailed analysis:

32-bit operating systems can access 4G space, but the 4G here refers to the addressing space and cannot simply be mapped to the memory. The reason why we often regard this space as the memory size is because memory is the main object of CPU addressing. In fact, the operating system's addressing includes addressing in the memory module, graphics card memory, sound card network card, and other hardware interrupts, so 4GB is the total of all device addresses that the operating system can handle. That is, the memory space is only part of the addressing space.

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