XP (32-bit) can use up to 4GB, with default configurations giving 2GB to
applications. This can be altered by changing the boot.ini file. There is
a /3GB option to increase process space to a max of 3GB, but it can be
somewhat problematic (see http://support.microsoft.com/kb/833721/en-us). XP
(64-bit) can use up to 128GB. Addressing is always done using unsigned.
larry
Chuck Norcutt wrote:
> Subject: [OM] [OT] Memory addressing limits for XP
> From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
> Date: Tue, 27 Mar 2007 07:34:55 -0400
>
> The AM2 motherboards I was recommended yesterday can all support up to
> 8GB or RAM. My question is can XP and/or applications running on XP
> exploit that much memory? I would guess that memory addressing on XP is
> limited to 32 bit integers but I don't know if that's signed or unsigned.
>
> So, is the application limit 2GB or 4GB?
>
> Is the XP system limit 2GB, 4GB or do they play some tricks to get more?
>
> Chuck Norcutt
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