Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I have 4GB RAM installed. PAE is off. How do I tell the Windows 7 32-bit kernel to allocate 3GB virtual paging area to user mode and only 1GB to kernel space?

share|improve this question
add comment

2 Answers

up vote 4 down vote accepted

Start a command prompt with Administrative privileges (write cmd in the Start search and right-click cmd.exe and select Run as Administrator). Write the command bcdedit /set IncreaseUserVA 3072 This increases the user address space to 3GB and shrinks the kernel address space to 1GB.

Do take care: If you have a badly coded driver this change can cause it to crash.

share|improve this answer
add comment

On Windows, you can add the /3GB flag to your boot.ini file to turn on OS level support. However, this will only allow applications that also have the appropriate flag (IMAGE_FILE_LARGE_ADDRESS_AWARE) turned on in their process header (see here for more details).

share|improve this answer
    
This won't work on Windows Vista and higher. They don't have boot.ini. But that link does explain how it works on Windows Vista so thanks. –  unixman83 May 8 '11 at 23:55
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.