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Note that, to access memory > 3GB, you'll need a 64-bit platform (kernel).
A PAE kernel will allow access to all the memory this motherboard supports. 32-bit kernels are restricted to a 4 Gig (virtual) address space - of which userspace can typically only access 3 Gig (on x86). Again, this is virtual addressing limit, not physical RAM. Also, there exists schemes to redress this.
A 64-bit environment (if applicable) will alleviate most memory addressing issues.
@syg00: True, but is PAE not limited to certain types of processors only?
@your_shadow03: 3.77GB (or rather, 4GB if you include swap) is the total.
From your posted output, I could see only 5 DIMMs of 512MB each listed (rather than 8), hence
my quick total of *AT LEAST* 2.5GB. But as this is a somewhat uncommon amount, I was thinking
that it's probably more and you just forgot to post a part of the output.
To repeat pixellany's question: what does your BIOS say about the amount of physical RAM?
To check this: reboot the machine, press the special key (F2, F12,...) that is indicated at the
very beginning to open BIOS. Don't change anything there, just look up the amount of memory and
then exit (without saving changes).