Citerar:
For the 12700K, one 8-pin EPS is enough. The two CPU_PWR connectors join together on the PCB and feed the CPU VRM, which turns the 12V into ~1V for the CPU to use. The technical background is that two cables going over two plugs and connectors will spread the flow of electricity more, and thus be able to supply more power to the VRM before the cables or plugs would get too hot.
This is more of a concern with the highest CPU model, where Intel traditionally uses a brute-force approach to achieve the performance crown. They have done this starting with the 9900K, and even more so with the 10900K, 11900K and 12900K. To the point where i think that the 10850K, 11700K and 12700K are actually the better all-round CPUs.
But anyway, if someone were to use a 12900K and were silly enough to overclock it further (even though Intel already pushed it to the limit by default), then the second 8-pin EPS12V would come in handy. But how they would still cool the CPU then is beyond me.