Pentium D 940 dual core. i386 or amd64 ?

[Mario Lobo]

Hi guys;

I just bought one and I was wondering if it works HTT/SMP on my FreeBSD 
6.2-STABLE desktop.

Would anyone recommend changing my currently installed i386 (days of waiting 
for xorg 7.2 and ports update) arch to amd64?

if so, is it possible to make this change of arch on the machine itself or 
will I have to reinstall?

Thanks in advance,
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