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Позволю процитировать доку.
Обрати внимание на слово virtual.
The 32-bit operating systems such as Windows 2000 and Windows Server 2003 provide access to 4-gigabyte (GB) of virtual address space. The lower 2 GB of virtual memory is private per process and available for application use. The upper 2 GB is reserved for operating system use. All operating system editions, starting with Microsoft Windows XP Professional and later, including Windows Server 2003, include a boot.ini switch that can provide applications with access to 3 GB of virtual memory, limiting the operating system to 1 GB. See your Windows documentation for more information on using the /3GB switch memory configuration.
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