kernel config file for amd64

[Jonathan Horne]

im building a system with the amd64, version of freebsd, but the system is a 
xeon nacona.  the GENERIC kernel config files reads:

machine         amd64
cpu             HAMMER
ident           GENERIC

does cpu HAMMER have a bad effect on a EM64 cpu?  should that line be changed, 
and if so, to what?

thanks,
Jonathan