FWIW, the things that affect me using 64 bit on a given machine are:
more than 3GB of RAM or
need more than 2GB in a single process or
doing 64 bit math (nb this isn't strict, you can get at the opcode in
32-bit installs, just requires effort) or
want to do 64 bit port testing/development
-> 64bit

otherwise, 32bit is better.

Some 64bit capable CPU's actually do 32-bit mode better than 64, and
vice-verca, but I don't recall which ones - and unless you're on the
performance edge it won't matter anyway.

-Rob

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