PAE (Physical Address Extension) enables your server to use more than 4 GB of RAM.
If you run Winver.exe and it reports more than 4 GB of memory, then the PAE specification is being used.
The /PAE switch in the C:\boot.ini file enables PAE, but some servers with hot plug memory enable PAE when the /PAE switch is NOT set in the C:\boot.ini file, unless the /NOPAE switch is set. The /NOPAE switch in the C:\boot.ini file disables PAE.
To verify that the /PAE switch is enabled on your server:
NOTE: The follow scriplet uses GetMEM.bat and VarLen.bat. set PAE=0x0 :: NOTE: PAE is enabled when PAE=0x1 call :getPAE>nul 2>&1 if "%PAE%" NEQ "0x0" ( @echo PAE is enabled on %ComputerName%. Memory is %MB% MB. ) ELSE ( @echo PAE is NOT enabled on %ComputerName%. Memory is %MB% MB. ) . . . . . . :getPAE call GetMem MB set key="HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" for /f "Tokens=2*" %%a in ('reg query %key% /V PhysicalAddressExtension^|find "REG_DWORD"') do ( set PAE=%%b ) goto :EOF
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