*Corrected mistake, thanks Martin. I have previously posted about memory usage on 7.10. All tests were done with an Ubuntu LiveCD on the same machine for both 7.10 and 8.04.1. A network card may have changed between 7.10 and 8.04.1. Applications used were Firefox, OpenOffice.org Writer, Rhythmbox, Totem and Gimp. All values copied out of Gnome System Monitor. Comparing Ubuntu 8.04.1 64 to 32

32 bit 64 bit Difference
Initial Boot 154.1 237.6 83.5
With Apps Open 262.7 395.7 133
I used the Phoronix Test Suite to attempt to get an idea of how ram access is changed from 32 bit to 64 bit. I was hoping to find a benefit for using 64 bit. I performed a very small test and did not find the benefit (in fact 64 bit was slighly slower). Results below: http://global.phoronix-test-suite.com/?k=profile&u=quigs-32083-11560-32025 Note: This was a very very small test. Comparing 7.10 to 8.04.1, Initial Boot Only
7.10 8.04.1 Difference
32 bit 146.0 154.1 +8.1
64 bit 212.9 237.6 +24.7