Actually they use a process called “binning” to determine what is a 1800X, 1700X, 1700, 1600X, all the way down to the cheapest CPU. Here is a quick video explaining it https://.com/watch?v=8AQPIBfIqMk So its more about not wasting what would otherwise be a perfectly fine CPU or GPU. By disabling the cores that just didn’t come out quite right, or didn’t meet factory voltage specifications for certain clock speeds. Which is why your CPU overclock failed with auto voltages. It wants more voltage to hit 3.6 GHz than an 1800X would at AMDs specified stock voltages.