How much memory do I have?

[Hiisi]

Original Poster, sorry for intruding the thread, but I have small
question to ask for those Gurus.
How much memory can I have on my computer? It's 32 bit desktop:
Linux imt.ru 2.6.30.5-43.fc11.i586 #1 SMP Thu Aug 27 21:18:54 EDT 2009
i686 i686 i386 GNU/Linux
Memory section of lshw says:
     *-memory
          description: System Memory
          physical id: 19
          slot: System board or motherboard
          size: 512MiB
          capacity: 2GiB

If I understand that correctly I'm not allowed to add more that 2GiB?
Using PAE kernel will I be able to install 4Gib?
Thanks for attention!
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Hiisi.
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