In both, RAM near the 4 GB point conflicts with memory-mapped I/O space. Thus, the "3 GB barrier" under x86 Windows "client" operating systems can therefore arise in two slightly different scenarios. This is not an architectural limit it is a limit imposed by Microsoft as a workaround for device driver compatibility issues that were discovered during testing. ![]() Nevertheless, these operating systems do not permit addressing of physical memory above the 4 GB address boundary. "In Microsoft's "non-server", or "client", x86 editions of Microsoft Windows: Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 8.1, the 32-bit (x86) versions of these are able to operate x86 processors in PAE mode, and do so by default as long as the CPU present supports the NX bit. It's artificial restriction imposed by Microsoft.
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