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On Windows, under normal circumstances a 32 bit process can only access 2GB of RAM (or 3GB with a special switch in the boot.ini file). When running a 32 bit process on a 64 bit operating system, how much memory is available? Are there any special switches or settings that can change this?
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Memory in 32 and 64-Bit Architectures In terms of Random Access Memory, 32-bit architectures can address 4GB of memory, maximum. A 64-bit architecture, in turn, has a theoretical limit of addressing 16 million TB of memory.
They're still limited to 2 GB since many application depends on the top bit of pointers to be zero.
The theoretical memory limit that a 64-bit computer can address is about 16 exabytes (16 billion gigabytes), Windows XP x64 is currently limited to 128 GB of physical memory and 8 TB of virtual memory.
The 64-bit versions of Windows don't provide support for 16-bit binaries or 32-bit drivers. Programs that depend on 16-bit binaries or 32-bit drivers can't run on the 64-bit versions of Windows unless the program manufacturer provides an update for the program.
2 GB by default. If the application is large address space aware (linked with /LARGEADDRESSAWARE), it gets 4 GB (not 3 GB, see http://msdn.microsoft.com/en-us/library/aa366778.aspx)
They're still limited to 2 GB since many application depends on the top bit of pointers to be zero.
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4 GB minus what is in use by the system if you link with /LARGEADDRESSAWARE.
Of course, you should be even more careful with pointer arithmetic if you set that flag.
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