This is interesting! Could you explain me how to understand which are the best cores? How I can config Intel Turbo boost 3.0? I've tried to activate it, in BIOS and installing the software, for example in Cinebench, the boost doesn't start.
BTW, the Turbo Boost works even if the CPU is overclocked?
My motherboard (Asrock X299 ITX/ac) recently had a BIOS update that shows the core rankings (those are tested and baked into the CPU by Intel). The turbo boost 3.0 application in Windows also has the CPU cores listed in that order. You won't be using the stock boost clocks Intel decided for all 7980XEs, so you're just using the Windows application+driver to have demanding work scheduled to the fast cores automatically.
So Cinebench (single thread) will be scheduled to run on the best core automatically when you have the TBT 3.0 application installed.