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Re: Using all of 4GB RAM... questions and Vista versus Linux...

On Wed, Oct 1, 2008 at 7:54 AM, Linuxguy123 <linuxguy123 gmail com> wrote:

a) On machines that do not allow PCI remapping, is the processor
physically disallowed from accessing that 4GB of RAM ?  Ie have the
address lines from the processor been disconnected from that RAM due to
being connected to the PCI devices ?

b) How do XP and Vista handle this ? Are they limited to 3GB of RAM
too ?

c) I am running the 32 bit version of Linux.  Would it make any
difference to my RAM access if I ran the 64 bit version ?


Maybe someone can word this better than I but here it goes. The memory limit is not really tied to the OS "TYPE" (i.e. Windows XP/Vista, Linux, etc) but more to the architecture (32-bit vs. 64-bit). As far as I'm aware, all 32-bit OS's will have this limitation and all 64-bit OS's will not. You can get Windows XP, Vista or Linux in both 32 and 64-bit flavors.

So to answer your question (c), yes, if you switch to a 64bit version of Linux you will be able to use all 4GB.


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