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Windows XP and RAM 3.5GB+

I Know there are lots of questions about this, and I also partly know the answer to my question, but I just can't seem to figure it out completely.

I have 4 gigs of ram which I understand is the maximum for win 7 32 bit. My system recognizes the 4 gigs and is able to use 2,9. Of Course I'm interested in using all 4. I have tried booting with PAE on, but I still get only 2,9Gb usable. How is this? Are the rest of the ram actually mapped, and the system just doesn't realize this, or do I have to do something else to get maximum performance for my 4 gigs of ram?

Thank you

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I know that question refers to XP not Windows 7, but the key thing is that you're running a 32 bit OS. – ChrisF Aug 9 '10 at 12:12
Not really though, because "not possible" is not really the answer I'm looking for. I Know it requires a hacky solution, but that's why I am asking. The adresses are being used right now, but I want to force the adresses to my RAM so I can use them fully. So what I am actually looking for is what I am asking for; WHY - when I am using the PAE - Physical address extension, is it not working? – Jakob Aug 9 '10 at 15:00
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closed as exact duplicate by ChrisF, heavyd, random♦ Aug 9 '10 at 13:37

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

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