I think you will find that this is a software issue and not due to the CPU.
Core Temp is not very reliable when it comes to reporting the temps, as I have discovered in various test scenarios with AMD systems. It might perform better on Intel, but I wouldn't trust it. Even on my own system, that I monitor with hardware, CoreTemp shows my 1090T about 3° - 5° lower than EasyTune 6 or AMD Overdrive which both report it more accurately against the hardware reported temps.
Other software utilities that you could use to show you the CPU temp are Everest or Speedfan.