On the whole, not much unless you have at least 4GB. In a few areas, however, 64 bit is a lot faster. For example, I saw some Ubuntu benchmarks the other day that showed that 64 bit does SSL more than twice as fast as the 32 bit version. Databases and multimedia are another area where 64 bit shines although the margin is definitely not 100% in these cases. But as I said, these are exceptions, as a rule the difference is only 10 to 20 % and sometimes there is no difference at all.
Last edited by jay73; 12-05-2008 at 04:51 PM.