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4 gig max, XP 32 bit


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#1 Bill_in_Texas

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Posted 30 September 2013 - 12:31 PM

I did a search but nothing came from it on this subject.  I am running XP 32 bit, 4 gb DDR2 SDRAM.  I was thinking of upgrading to 8 gb RAM which is the max my machine will take but read that 4 is all a 32 bit machine will effectively use.  Why is this?  Thanks.



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#2 OldPhil

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Posted 30 September 2013 - 12:35 PM

I can not answer the tech reason, but many XP machines will only recognize 3g.  Curious is your setup recognizing the full 4G?


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#3 Bill_in_Texas

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Posted 30 September 2013 - 12:45 PM

No it doesn't, sorry I didn't make that clear.  



#4 dc3

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Posted 30 September 2013 - 12:54 PM

A 32-bit Windows operating system will recognize up to 4GB of RAM, but will not be able to utilize the total amount because the address space is only 4GB in size.  The draw from critical functions such as the system BIOS, motherboard resources, memory mapped I/O, AGP, PCI, PCI-E, and other memory allocations for PCI devices use this space as well.  After all these functions have taken their share of the address space you usually will have around 3.5GB of free address space.

 

Hope this helps. 


Edited by dc3, 30 September 2013 - 12:55 PM.

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#5 Bill_in_Texas

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Posted 30 September 2013 - 01:20 PM

So with 8 gb installed I would essentially have 4 gb sitting there doing nothing, correct?



#6 Animal

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Posted 30 September 2013 - 01:48 PM

Much better explanation than I can come up with: The 4GB Windows Memory Limit: What does it really mean?

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#7 dc3

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Posted 30 September 2013 - 01:52 PM

So with 8 gb installed I would essentially have 4 gb sitting there doing nothing, correct?

 

 

That would be my understanding.


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#8 Bill_in_Texas

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Posted 30 September 2013 - 02:04 PM

Thanks for the article, much was over my head but I understood that 4 is it and why.

 

Thanks for the responses dc3.

 

Time for a new machine I think.



#9 hamluis

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Posted 30 September 2013 - 02:46 PM

It's not the machine that's limited...it's the choice of O/S.

 

If you ran 64-bit XP or 64-bit Vista or 64-bit Win 7 or Win 8...the memory installed limitations increase, but are still impacted by motherboard limitations.

 

Louis



#10 Bill_in_Texas

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Posted 30 September 2013 - 04:05 PM

Thanks Louis.  You are right but I won't try to run Win 7 on this machine.  






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