[ltp] The mystery of missing RAM

[Jeffrey Franc-Law]

Depends also on the chipset.  For instance, the intel 945GMA will only 
recognize about 3gb of 4gb installed---64bit os does not help.

some references....

http://blogs.msdn.com/hiltonl/archive/2007/04/13/the-3gb-not-4gb-ram-problem.aspx

http://forums.macrumors.com/showthread.php?t=373577

http://forum.tabletpcreview.com/showthread.php?t=6809

ciao,
jfl


Atul Chitnis wrote:
> On Mon, 17 Mar 2008 19:31:44 -0400
> "David A. Desrosiers" <desrod@gnu-designs.com> wrote:
> 
>> Where is 1,063M or 1,053M of my new RAM going? I could certainly use
>> it. 
> 
> If you are running a 32-bit OS, memory addresses grow from 0 upwards,
> while memory for PCI grow from 4 GB downwards. This causes most of the
> upper 1 GB to become unavailable to the OS. 
> 
> Running a 64-bit OS can solve this issue, as does running a PAE enabled
> kernel, but that does not always work. The best you can expect in
> that case is about 3.3GB, but much of this depends on the machine's
> architecture, BIOS, the OS, etc.
> 
> Atul

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