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Date:      Tue, 24 Apr 2007 14:43:49 -0500
From:      "Thomas T. Veldhouse" <veldy@veldy.net>
To:        Jonathan Horne <freebsd@dfwlp.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Memory >3.5GB not used?
Message-ID:  <462E5DF5.1060708@veldy.net>
In-Reply-To: <2271.192.168.125.134.1177438307.squirrel@webmail.dfwlp.org>
References:  <01d301c78699$d6a36820$0300020a@mickey>	<20070424140528.95287ff4.wmoran@potentialtech.com> <2271.192.168.125.134.1177438307.squirrel@webmail.dfwlp.org>

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Jonathan Horne wrote:
> i have a system with 4GB memory, doing the same similar behavior.  but, on top
> of not using the last few hundred megs of ram, even the POST shows like 3.6 or
> 3.7GB of ram.  is PAE still a solution for my case?
>
> [jhorne@canopus ~]$ dmesg | grep memory
> real memory  = 3958833152 (3775 MB)
> avail memory = 3875762176 (3696 MB)
>   

My motherboard has a BIOS option as to how the memory is to be used.  If 
it is remapped, then you can see 3.2GB from a 32-bit OS (like Windows XP 
or Vista x86).  If I turn remapping off, then only 3.0GB will show in 
such a 32-bit OS.  However, a 64-bit OS can see all the memory and use 
it accordingly. 

Check your BIOS.

Tom Veldhouse





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