what cpu type to use for a intel duo e6850 (i386 or amd64)

[Aryeh Friedman]

Currently I have done a build/installworld build/install/kernel using
a i386 CPUTYPE (w/ SMP and APIC set in the kernel (I am using the
default sys/i386/conf/GENERIC) do I need to change this to amd64 for a
intel duo e6850?  (I have had several seemingly unrelated problems
that no one seems to be able to reproduce)... btw it is a P35 chipset