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Windows x86 physical memory is 24-bit?

Fresh5 days ago
Mar 15, 2026876 views
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Problem

I am reading the new book, Windows Internals 5 about memory management (chapter 9 in Physical Address Extension PAE section). It is mentioned "A 32-bit system represents physical addresses internally with 24 bits" on page 770. I am totally confused, and I think x86 physical memory should be also ad…

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Fix for: Windows x86 physical memory is 24-bit?

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Here are more details about what booting /PAE means from Chapter 7 of the book "Inside Windows 2000," by David Solomon and Mark Russinovich. All of the Intel x86 family processors since the Pentium Pro include a memory-mapping mode called Physical A…

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