So as I read none of the cores goes past 3950Mhz correct? Here is a couple things you can do to resolve this issue. Firstly go to your BIOS and enable D.O.C.P and before you do this make sure to go and set BIOS to set to optimized defaults then enable the D.O.C.P. Next boot up and go to Windows and go to control panel then power options and set to performance. After doing that click on change power options or settings rather and then go to Processor State and set both to 100 percent both minimum and maximum. This way the core speed will not go down when your doing nothing and when your doing something its guaranteed to be at its peak according to BIOS settings. After you have done this get back to us.✝🎗👶