Thanks for coming back to the community.
Sorry about the trouble. It seems you may have defective processor. I would understand that Intel SpeedStep Technology makes the processor run slower because is saving power, however, if this option is disabled at BIOS level it should not interfere with processor speed.
I may say you have defective processor then I recommend contacting Intel customer support for possible warranty options:
www.intel.com/chat and choose processor area
Allan.
