PAE - how to tell if it's enabled?

Discussion in 'Windows Server' started by John Lynn, Nov 10, 2006.

  1. John Lynn

    John Lynn Guest

    On Windows Server 2003, if I look at Control Panel/System, on the General
    tab, under the computer name, it says "Physical Address Extensions". Does
    this mean that PAE is enabled? I didn't put the switch in the boot.ini file,
    though... I have been unable to find the General tab documented anywhere.
     
    John Lynn, Nov 10, 2006
    #1
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  2. Is your server using hot-add memory devices? If so PAE will be enabled
    automatically without the need to add the /PAE switch in the BOOT.INI. If you
    do not have hot-add memory PAE will not be enabled unless you specify /PAE in
    the BOOT.INI.

    MW
     
    Marcus Walshe, Nov 10, 2006
    #2
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  3. John Lynn

    John Lynn Guest

    Is it safe to assume that if "Physical Address Extensions" appears in
    ControlPanel/System on the General tab, that PAE is enabled; perhaps because
    the server is using hot-add memory devices?
     
    John Lynn, Nov 10, 2006
    #3
  4. Yes. There are two instances where PAE may be automatically enabled;
    1. If you server supports Hot-add memory.
    2. If DEP is enabled by chipset support.

    Please refer to these two articles for more information on this.
    http://support.microsoft.com/default.aspx?scid=kb;en-us;283037
    http://support.microsoft.com/default.aspx?scid=kb;en-us;900524

    To check is PAE is automatically enabled you can browse the registry and
    check that the vaule is 1 (enabled) more information here
    http://www.microsoft.com/whdc/system/platform/server/PAE/PAEdrv.mspx but not
    really advisable.

    If you want to disable PAE, the best way is to use the /NOPAE switch in the
    BOOT.INI. This can be done for Windows 2003 SP1 and Windows XPSP2 More
    details here http://support.microsoft.com/kb/900524/.

    hope this helps,
    MW
     
    Marcus Walshe, Nov 10, 2006
    #4
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