Well, I messed up. After getting a newer version of CPUz I was able to see the proper core speed and it is 4.3Ghz when all cores are active. Somehow the earlier version was displaying 4.6Ghz and 46 multi.
But I still am not sure about an MCE setting on this motherboard. Under expert mode there is no setting that seems to be related to turbo enhancement. Not that it matters much for me now, just wondering if MSI has a different name for it, or if that feature is only avail on K cpus?