Application Memory for 32 Bit Applications under 64 Bit Windows 2003

Discussion in 'Windows 64bit' started by Will, Nov 7, 2006.

  1. Will

    Will Guest

    Windows XP 32-bit has a 4GB memory limit, with 2 GB reserved for
    applications and 2 GB for the system. With a tweak, you can make the
    system allow 3 GB for applications and reserve 1 GB for the system. You
    then have to hack the .EXE to make it aware that 3 GB are available to use.

    My question is how much memory can a 32 bit Windows XP application use under
    64 bit Windows XP? It would be extremely cool if somehow an entire 4 GB
    virtual memory space could be dedicated to one application, using 64 bit
    memory for all of the reserved system.
    Will, Nov 7, 2006
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  2. Will

    Peter Lawton Guest

    It is extremely cool then, if your 32bit application is compiled to be large
    memory aware it can see 4GB under x64

    Peter Lawton
    Peter Lawton, Nov 7, 2006
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  3. Any application that can take advantage of the /3GB switch will
    automatically see 4 GB under x64 Windows. No switches required. However,
    applications which can only see 2GB of memory will still only see 2 GB -
    that's the application's limitation, not the OS's.
    Charlie Russel - MVP, Nov 7, 2006
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