This problem occurs in Windows Vista, in Windows Server 2003, and in Windows Server 2008.
Important Windows Vista Service Pack 1 (SP1) made changes to the way components of the user interface (UI) report memory. For example, some components of the Windows Vista SP1 UI will now report when there is 4 GB or more of total physical memory that is installed on the computer. For more information about how memory is reported in Windows Vista Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
- The computer is in Physical Address Extension (PAE) mode.
- The computer has 4 GB of RAM.
Additionally, some x64-based operating systems can address up to 2 terabytes (TB) of RAM. For more information, visit the following Microsoft Web page:BCDEDIT /SET PAE ForceEnable.
Note There is no Boot.ini file in Windows Vista. The Boot.ini file is used for legacy Windows versions when dual-booting only
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
For example, if the computer has 4 GB of RAM installed, and you add 4 GB of additional RAM, Windows may recognize only 4 or 6 GB of RAM instead of the full 8 GB. The redundant memory feature or the memory mirroring feature may be enabled on the new memory banks without your knowledge. These symptoms resemble the symptoms that occur when you do not add the /PAE switch to the Boot.ini file.
Memory limitsFor more information about the memory limits for Windows operating systems, visit the following Microsoft Web site:
Article ID: 929580 - Last Review: Oct 20, 2009 - Revision: 1