Have a look at this Wikipedia page which outlines some differences
between the AMD and Intel versions of 64-bit :
http://en.wikipedia.org/wiki/EM64T
It isn't only Postgres. I work on a number of other server applications
that also run much faster on Opterons than the published benchmark
figures would suggest they should. They're all compiled with gcc4,
so possibly there's a compiler issue. I don't run Windows on any
of our Opteron boxes so I can't easily compare using the MS compiler.
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