4GB Limit Win XP Pro

By Savage1701
May 1, 2008
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  1. Ok, I've searched the forums and can't find a specific answer to this. I upgraded my memory with (4) 1GB DIMM's on Win XP Pro 32-bit. I booted up and checked the properties of "My Computer" and it said 4 GB RAM. Now all of a sudden a couple days later it says "2 GB RAM". Not sure what is going on here. Could I have done something? Any thoughts are appreciated.
  2. Route44

    Route44 TechSpot Ambassador Posts: 12,109   +21

    XP because it is a 32-bit ssystem the most it will recognize is 3 gigs of RAM. Even Vista Home Premium 32-bit is limited in this way. To utilize 4 gigs takes a 64-bit OS.
  3. Savage1701

    Savage1701 TechSpot Enthusiast Topic Starter Posts: 279

    I'm aware of all that. What I am trying to find out is why one day it says 4GB and the next it says 2GB. I've read a ton of threads on this, including the use of the /PAE and /3GB switches. I'm just trying to find out why one day "My Computer" shows 4GB and the next it shows "2GB". My BIOS consistently shows 4GB on its pre-boot screen.
  4. Didou

    Didou Bowtie extraordinair! Posts: 5,899

    Two memory modules might've gone bad. Have you tried a memtest ?
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