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[ubuntu] limit ram 32 or 64 bits? Once and for all

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http://ubuntuforums.org – i have ubumtu 12.10 ... my uname -a is Linux ubuDev 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:05:29 UTC 2013 i686 i686 i686 GNU/Linux meaning, 32 bits but i got 8gb ram free -m -t total usado livre compart. buffers em cache Mem: 8018 4616 3402 0 47 624 -/+ buffers/cache: 3943 4074 Swap: 3814 0 3814 Total: 11833 4616 7217 SO... am i using fully potential 8gb or this is just wrong ? I read other threads about this subject, but no one answer for sure... any (Hardware)