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New RAM doesn't fully work

Discussion in 'Hardware' started by keithtruman1, Jul 18, 2009.

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  1. keithtruman1

    keithtruman1 Thread Starter

    Joined:
    Jul 18, 2009
    Messages:
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    I just upgraded my RAM from 1Gb to 4Gb. My motherboard (MSI) has 4 available slots. However, when all 4 RAM cards are in the slots, my PC is only showing I have 3Gb RAM added. I have tried all combinations of the1Gb RAM with the 4 slots and I have confirmed all my RAM is working and so are all the slots. For instance, when I put in 3 of the 1Gb RAM into 3 of any of the slots the PC shows 3Gb added, its just that whenever I add the 4th 1Gb RAM that it still only shows 3Gb.

    Keith
     
  2. Rich-M

    Rich-M

    Joined:
    May 3, 2006
    Messages:
    22,443
    32 bit systems of Windows XP and earlier have a max usage of between 3.2 and 3.5 gb ram. Windows Vista after Sp1 can show the 4 gb, but not really utilize it. Only 64 bit systems will show and use more than 3.5 gb ram and BTW each board reads what they read differently. Also remember onbaord video if you are using it reduces the amount available to the system as well.
     
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