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It would not be possible to be running Win10 32-bit and have Task Manager show a total of 16 GB, as it does in the OQ. And btw, the per-process limits the OS poses are on virtual memory, not RAM. There is no call you can make in Windows to allocate RAM per se. (Well, AWE, but that takes admin-level privilege and almost nothing uses that except some system programs.) You allocate virtual address space (say with VirtualAlloc) and then use it; as you use it, the OS allocates RAM to your process ("demand paging"). But of course not all of it has to be realized in RAM at one time.
– Jamie Hanrahan
Commented Sep 20, 2017 at 9:57

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