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Running Windows (or anything else) on your Mac Discussion of Classic or running Windows, Linux and other OSes on the Mac.

XP only showing 3GB RAM, OS X shows 4GB...


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wgilles

 
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I'm not sure what the deal is, but my version of XP is showing 2.96GB of RAM, but Leopard shows 4. Does anyone know how to fix this?
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There really isn't a way to fix it. Windows XP is a 32-bit operating system, and as such, it only recognizes a maximum of 3GB of RAM.

Leopard recognizes 4GB because it's a 64-bit operating system.

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I understand that this is a known limitation of XP.

Derek McNelly, I am not sure I understand your post. A 32 bit operating system that was limited in its addressable memory by a 32 bit (or higher) address bus would max out at a memory size that was a power of two, not at 3GB. I suspect MS at work again here, not the 32 bit boundary!

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wgilles

 
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Yeah, the 32 bit is supposed to support 4GB...is there a solution for this or no?
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The 32 bit version of XP cannot address 4GB of RAM, whether it's supposed to or not. For a detailed explanation of why, see here:
http://www.dansdata.com/askdan00015.htm

There is no fix except to install a 64 bit Windows OS; either XP64 or one of the various 64 bit flavors of Vista.

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Quote:
Originally Posted by mac57 View Post
I understand that this is a known limitation of XP.

Derek McNelly, I am not sure I understand your post. A 32 bit operating system that was limited in its addressable memory by a 32 bit (or higher) address bus would max out at a memory size that was a power of two, not at 3GB. I suspect MS at work again here, not the 32 bit boundary!
You're right. I was getting chipsets and bit addresses mixed up. Sorry for that.

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wgilles

 
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Well I read that thing and it says even some 64 bit systems still won't support the 4GB of RAM, does anyone know if the 64 bit of XP or Vista will support it?
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