Vista Home Premium sees 3GB BUT support 4GB HOW?

Discussion in 'Windows Update' started by war_wheelan, Nov 28, 2007.

  1. war_wheelan

    war_wheelan Guest

    Vista Home Premium sees 3GB BUT support 4GB HOW?

    I have Vista Home with 4GB install, but the system only sees 3GB. Is
    there a way for Vista Home to see the entire 4GB?
    war_wheelan, Nov 28, 2007
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  2. The system uses (95% sure) if on
    --> VISTA:Up to 1/4 of your memory, 2 GB of RAM used usually.
    --> XP: Up to usually 1/8-1/10
    Brian Sullivan, Nov 28, 2007
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  3. war_wheelan

    Jim Guest

    No. XP (like many many others) uses memory mapped I/O. XP accesses I/O
    controllers as if they were memory locations.
    Chaos would insue if both the RAM and the I/O controllers respond to the
    same memory addresses. Thus, XP makes that part of the
    physical RAM which overlays the contollers unavailable.

    The solution would be for MS to use the PAE instruction to move the
    controllers well away from the RAM. They might indeed do this in some
    future edition of Windows.
    But, there is no likelihood that they would implement such a feature in XP.

    I do understand that the Server edition does use the PAE instruction in this
    manner. But, what is lacking (and precudes implementation) are the physical
    address lines in non server CPUs.
    Jim, Nov 28, 2007
  4. You may order and install an x64-enabled Version of Windows Vista if you
    have an appropriate CPU.

    You can order a DVD in you language for a small fee (about 12 $) on the
    official x64-Site

    at the bottom of the page. Be sure to have your product key ready for the
    order process.

    You should, if you want to switch, be aware of the advantages and
    disadvantages (just search the web for "Vista x64") and you should also
    download all the drivers for your system in 64-bit versions. If there is no
    signed 64-bit driver for one of your hardware components you cannot use it
    under Vista x64, 32-bit won't work, unsigned drivers require editing the boot

    Andreas Schöneck, Nov 29, 2007
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