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MSDN Article: Memory Limits for Windows Releases; The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed – explains the issue; Windows Vista SP1 includes reporting of Installed System Memory (RAM) – details about the RAM limit
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. [18] Thus, the "3 GB barrier" under x86 Windows "client" operating systems can therefore arise in two slightly different scenarios.
The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux, although some variants of the latter can overcome this barrier. [2]
These do not show how much has actually been written to the pagefile, but only the maximum potential pagefile usage: The amount of pagefile that would be used if all current contents of RAM had to be removed. In Windows 2000 and Windows NT 4.0, these same displays are labeled "Mem usage" but again actually show the commit charge and commit limit.
Windows 10 Pro for Workstations is designed for high-end hardware for intensive computing tasks and supports Intel Xeon, AMD Opteron and the latest AMD Epyc processors; up to 4 CPUs; up to 256 cores; up to 6 TB RAM; the ReFS file system; Non-Volatile Dual In-line Memory Module ; and remote direct memory access (RDMA).
Windows 10 November Update (also known as version 1511 and codenamed "Threshold 2") is the first major update to Windows 10 and the second version of the operating system. It carries the build number 10.0.10586.
However, "client" versions of 32-bit Windows (Windows XP SP2 and later, Windows Vista, Windows 7) limit physical address space to the first 4 GB for driver compatibility [16] even though these versions do run in PAE mode if NX support is enabled. Windows 8 and later releases will only run on processors which support PAE, in addition to NX and SSE2.
Memory areas of the IBM PC family. In DOS memory management, conventional memory, also called base memory, is the first 640 kilobytes of the memory on IBM PC or compatible systems. It is the read-write memory directly addressable by the processor for use by the operating system and application programs.