The cool part is that on the 3900X you basically have 2 chip-lets, each having 6 cores. In my case, i can see that one of my chip-lets looks pretty solid with core 0 going as high as 4,550.2 GHz which is very close to the advertised max turbo speed of 4.6 GHz.
I also like the fact that AMD got Windows 10 to use the best core during certain processing.
Please use HWiNFO for the readings.
Interestingly, Ryzen Master reports Core 03 on CCD0 and Core 07 on CCD1 as my fastest cores.
AMD Ryzen 9 3900X, Taichi X570, Trident Z Royal Silver 3600Mhz fast, Asus Strix RTX2080 OC, Samsung 970 Evo Plus Nvme 1Tb, Evga 850W G+, Nzxt Kraken X62 AIO