This is not a bug, This is due to operating systems and memory
manufactures having a different definition of GB, you will see the same
thing in windows.
I know this is an old bug, I am going through trying to clean up and get
old bugs some attention, sorry this did not get any when it was new.
** Attachment added: Screenshot.png
http://launchpadlibrarian.net/25803744/Screenshot.png
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Memory amount incorrect in system monitor
https://bugs.launchpad.net/bugs/364385
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