12900K has 8 high performance cores (with 2 hardware threads each, look up hyperthreading), and 8 efficiency cores for a total sum of 24 hardware threads.
Previous Intel generations have only had so called high performance cores (except, maybe, for the Atom line of CPUs), even though not all of them have had hyperthreading enabled.
Previous Intel generations have only had so called high performance cores (except, maybe, for the Atom line of CPUs), even though not all of them have had hyperthreading enabled.