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I have Ubuntu 12.04 32bit and system is displaying all of my ram 5.7 GiB, how is this possible?

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You have a integrated video card ? –  warl0ck Apr 29 '12 at 16:36
    
uname -a will show 3.2.0-24-generic-pae The pae part allows you to use more ram ;) –  Rinzwind Apr 29 '12 at 16:37
    
@warl0ck yup i have intel hd3000 and gf325 –  Neven Blazic Apr 29 '12 at 22:13
    
@Rinzwind right , cool :) –  Neven Blazic Apr 29 '12 at 22:13
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2 Answers

Because Ubuntu 12.04 is using the PAE kernel by default.

https://help.ubuntu.com/community/EnablingPAE

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Physical address extension - aka PAE - lets the CPU "address" (Which means see and use) all the available memory.

How? PAE kernels (yours, for example) use a nice trick wich is transparent to applications, remapping physical memory. It's a sort of workaround, you can find more info here http://en.wikipedia.org/wiki/Physical_Address_Extension. Anyways, you'd better switch to 64bit!

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I did try 64bit version but there was lots of problems, and system was unusable so i switched back to 32bit –  Neven Blazic Apr 30 '12 at 7:38
    
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