I looked at the SPEC scores in details, and I don't understand where you see that the "non-paralle result of SPECint2006 is much faster than the parallel". Here is a SPECint2006 result with auto-parallelization for a 3 GHz Xeon [1]: 20.9/24.3. This is better than your non-parallel 20.2/22.6.
[1] http://www.spec.org/cpu2006/results/...916-02014.html
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