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XP won't recognize all my Ram

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XP won't recognize all my Ram

jmaster299
I have a newer Dimension E520 from Dell that won't recognize all of the RAM that I have installed. Per Dell, the system can handle 4GB of DDR2 Ram at 533MHz. It has a total of 4 paired Ram slots and it came loaded with 2GB; a 1GB stick in two of the slots with two open slots. I added 2 Kingston Technology 1GB PC5300 240-pin DDR2 DIMM Memory sticks. Per Kingston, these RAM sticks are compatible with PC5300 and PC4200 DDR2 memory slots and they will operate at 667MHz when used in PC5300 slots and 533MHz when used in PC4200 slots, I have PC4200 slots at 533MHz so they should work just fine. All Ram sticks are installed and paired properly. Also, the system has a 1066fsb. All 4GB of RAM are recognized by the Bios system boot menu but when I check the system info after Windows loads, it only lists 3.0GB of ram. I have been told that XP operates at a max of 3GB of Ram because it is a 32bit OS but I have also been told there is a way to change this with Bios settings. How do I get Windows to safely use ALL 4GB of the Ram I have installed??? Other info, my computer uses a Intel Core2 Duo E6400 processor @ 2.13GHz, I also have a ATI Radeon PCIe X1300 Pro with 256mb of on board memory. I really want to get the most out of my system. The System menu in Windows does say Physical Address Extension below where it lists the Ram so I am guessing that I don't need to add /PSE to the boot.ini file.
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    animatech

    Hi,
    This is a common problem today with us loading as much RAM as we can into our system.
    XP (32 bit) has an address space limit of 4Gig.
    This address space is used by other devices as well hence your missing 1Gig.
    I have added a couple of good reading material links on the subject below
    http://tinyurl.com/yvq7od
    http://tinyurl.com/3atajv
    This problem is resolved in 64 bit OS.
    As for now you can always look at your devices and check which one don't need to use the address spacing for example your graphic card which already has 256MB of RAM etc..
    Hope this helps.

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    lister

    The first reply on this thread provides a link to two technical articles that worked OK when posted (7-28-2007), but by now (9-21-2009) they are no longer any good.

    An example of why it is a good idea to post long URL's (because they have longer lives) and also short URL's line the one from tinyurl because sometimes a reader doesn't know how to stitch a broken URL back together.

    I'll keep looking .....

  • +
    0 Votes
    animatech

    Hi,
    This is a common problem today with us loading as much RAM as we can into our system.
    XP (32 bit) has an address space limit of 4Gig.
    This address space is used by other devices as well hence your missing 1Gig.
    I have added a couple of good reading material links on the subject below
    http://tinyurl.com/yvq7od
    http://tinyurl.com/3atajv
    This problem is resolved in 64 bit OS.
    As for now you can always look at your devices and check which one don't need to use the address spacing for example your graphic card which already has 256MB of RAM etc..
    Hope this helps.

    +
    0 Votes
    lister

    The first reply on this thread provides a link to two technical articles that worked OK when posted (7-28-2007), but by now (9-21-2009) they are no longer any good.

    An example of why it is a good idea to post long URL's (because they have longer lives) and also short URL's line the one from tinyurl because sometimes a reader doesn't know how to stitch a broken URL back together.

    I'll keep looking .....