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4 GB Memory Installed But Only 3.25 Showing

About a year ago I put in 4GB memory, everything worked fine.

Until I reinstalled windows, now it's only showing 3.25.

What is the problem here? Can I get it back?
5 answers Last reply Best Answer
More about memory installed showing
  1. If you're running Windows XP, that's normal. It won't show the full 4GB but you have it.
  2. I'm running Vista
  3. Best answer
    IF you are on a 32 bit version of the OS then that is normal - 32 bit programs can only address 4GB of memory (since 4GB = 2^32 address spaces) in total (this includes the video memory pages and upper level memory space reserved for the OS ) which leaves about 3.25 GB of addressable memory still available for system RAM - to use more than that requires going to a 64 bit version of the OS which can address 2^64 address spaces.
  4. Best answer selected by Jus136.
  5. Thanks!
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