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    nc4400 4Gb x64 vista but only 3.5Gb

    Discussion in 'HP' started by purezerg, May 23, 2009.

  1. purezerg

    purezerg Notebook Consultant

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    I having a weird issue.
    I installed 2x2Gb ram and vista x64.
    vista shows 4Gb available but only 3446Mb visable in task manager.

    what happened to the other 0.5Gb?

    [​IMG]
     
    purezerg, May 23, 2009
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  2. purezerg

    purezerg Notebook Consultant

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    anyone have any ideas?
     
    purezerg, May 25, 2009
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  3. Kdawgca

    Kdawgca rotaredoM repudrepuS RBN

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    The T7200 sugest that you have a Intel 945 chipset which will not be able to fully see/address 4GB of ram even with a 64bit OS(Hardware limit-see here for Microsoft article on the "issue"). Vista SP1 reports the amount installed, not how much you can use(why its reported as 4GB and you can only use ~3.5GB).
     
    Kdawgca, May 25, 2009
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  4. purezerg

    purezerg Notebook Consultant

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    i think i know why, the bios doesnt have memory remap function. the CPU supports x64, so will the NB, I now remember that my desktop had the same issue, had to enable Memory remap to use max ram.
     
    purezerg, May 25, 2009
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  5. Kdawgca

    Kdawgca rotaredoM repudrepuS RBN

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    Even if the Bios support memory remapping, your chipset does not support 8GB of address space which is needed to be able to use 4GB of ram...

    From the Microsoft article I posted above
     
    Kdawgca, May 25, 2009
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  6. purezerg

    purezerg Notebook Consultant

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    i pop down to HP service centre.. ask them about it. the engineer said that the IGP used 512Mb. i'm like "hurh?" i thought onboard video only uses 128mb at max. whatever it is. I doubt my wife would know the speed difference between 3.5Gb and 4Gb ram. i installed the x64 version of vista cuz it's less prone to viruses. not to mention it's lean and not bloated vista.
     
    purezerg, May 25, 2009
    #6