Top of the line CPUs get the very best silicon and should result in the very best overclocking. In order, those CPUs have been:What is most disappointing about Intel 10th is their overclocking, they simply clock worse than 8th gen, what the heck ?
The majority of 8700K can reach 5.1ghz and above (HUB tested 10 retail samples and 7 of them reach 5.1ghz and above, Silicon lottery statistics also show ~70% of 8700K can reach 5.1ghz and above) while 10600K can barely reach 5.0ghz from all the reviews I saw and 5.1ghz show signs of instability in GamersNexus testing (lower 1% and 0.1%).
It's safe to assume that 8700K (or 8086K) is still the 2nd best gaming CPU beside the 10900K when you overclock them. And yes 8700K can clock higher than 9700K if anyone is asking.
Also only 20% of 10700K can reach 5.1ghz, that's just pathetic
Every time one CPU is supplanted at the top by another, the now lesser CPU is consigned to lower quality silicon. Best example of this was after the 9900KS came out, people started reporting that the new 9900K CPUs no longer overclocked like they used to. Because that top silicon was now being reserved for the 9900KS.
Same goes for the 10700K and 10600K. They get the lower quality silicon so they will need more voltage to achieve the same clocks and more often top out at a lower speed.
So in terms of OC clock speed 8700K > 10600K