Ubuntu 12.04 x32, x32PAE and x64 performance compared

No more reason to hold out for x64 if you have even a 2GB system.

http://www.phoronix.com/scan.php?page=article&item=ubuntu_1204_3264&num=1

[IThe performance advantage of 64-bit over 32-bit Ubuntu is clear. If you are still running the 32-bit version on 64-bit capable hardware you should really consider switching with the "Precise Pangolin" now that the 64-bit Flash is on par with the 32-bit version, OpenJDK works well on 64-bit, etc. The 32-bit situation should at least become a bit more interesting with Linux x32 support.][/I]