Windows Server 2003 memory limits

We had a call about memory thresholds of Windows Server 2003. A Hyperion application required more than 2 GB of memory for its process. 32-bit Windows doesn't allow a process more than 2GB in size. To enable it, you need to start windows with /3GB switch.

A table of memory limits is available on this MSDN article.

A 32-bit process can have a memory address of 2GB in both 32-bit and 64-bit windows.

A 64-bit process can have 2 GB in 64 bit windows and

x64: 8 TB with IMAGE_FILE_LARGE_ADDRESS_AWARE

Intel IPF: 7 TB with IMAGE_FILE_LARGE_ADDRESS_AWARE