Yes, that is right. Getting it wrong leads to signal 4 (SIGILL, Illigal innstruction) crashes. It also selects cpu optimized code in SSL, as well as any ports that ask for it.
The options for AMD64 are opteron, athlon64, nocona, prescott and core2 (from /usr/share/examples/etc/make.conf on a AMD64 7.0-STABLE as of July)
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The only dumb question is a question not asked.
The only dumb answer is an answer not given.
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