SoF, massman,
I see - thanks for the clarification.

Hazzan,
did you set SPi process affinity to run only on the fast cores when you ran at 5.7GHz? looking thru the screenshots it seems that in the 5.7G run you had core 0 and 1 set to that speed and the other two were at 5.5GHz. if process affinity was not set to core 0 and 1 only then that might explain why the score is close to your 5.5GHz run (all cores at 5.5GHz).