we've been facing the issue described in this topic Low CPU speed, shows normal in safe mode for quite a while. The topic is locked an unsolved. We found a solution and wanted to share
The issue regards CPU running at bad frequency (0.8ghz instead of 3.5). The OP had a quite similar mobo and CPU. The involved part is not the CPU but the motherboard. A recent BIOS update (july 2016) enables by default a parameter named "Intel Adaptive Thermal Monitor". It seems not to be supported correctly and forces the CPU to run at 0.8ghz. Disabling it fixes the problem. More info here : MSI USA - Online Technical Support FAQ
Hope that helps, cheers guys
Thank you very much for your assistance.
We will take your information for further references, in order to solve this matter.
Your help is very appreciated.