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Windows 7 32-Bit Max Ram

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  • 3gb

    Saturday, January 17, 2009 4:36 PM
  • Hello,

    Between 3.25GB and 3.5GB depending on your video card.  That will be the max recognized and able to be used by 32 Bit Windows.

    Regards,


    ~Alex T.~
    ~Windows Desktop Experience MVP~
    Thursday, January 29, 2009 5:02 AM
    Moderator
  • Hello,

    Between 3.25GB and 3.5GB depending on your video card.  That will be the max recognized and able to be used by 32 Bit Windows.

    Regards,


    ~Alex T.~
    ~Windows Desktop Experience MVP~
    So how about mine, I use Radeon HD 4650 512MB card, and I have 3.5GB install why my windows said I have only 2.87GB usable? oh and here is my pc spec: Intel P4 HT 550J 3.40Ghz, 3.5GB Ram, 160HDD, HIS Radeon HD 4650 512MB Video Card, and I useWindows 7 Ultimate Build 7600. Thanks
    Friday, June 04, 2010 10:25 AM
  • Hi,

    Windows will only see a portion of your 3.5GB physical RAM.
    This behavior is due to "memory mapped IO reservations". Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. This is independent of the OS running on the machine.

    Significant chunks of address space below 4GB (the highest address accessible via 32-bit  (2 to the 32nd power = 4GB)) get reserved for use by system hardware:

    • BIOS – including ACPI and legacy video support

    • PCI bus including bridges etc.

    • PCI Express support will reserve at least 256MB, up to 768MB depending on graphics card installed memory

    Globally, between ~256MB and 1GB of address space below 4GB may be reserved for hardware use. The OS will not see these Address spaces.

    Cheers

    Rem

    • Proposed as answer by Zeus76 Tuesday, June 08, 2010 5:09 AM
    Friday, June 04, 2010 12:27 PM