I have a Intel i7 7700k it runs 4,5Ghz stock i beheaded the cpu and exchanged the thermal paste with liquid metal i use a noctua NH D15 cooler and kryonaut der8auer
Intel Core i7-7700K Tested With Delid, Massive Improvement In Temps
Power and Overclocking - The Intel Core i7-7700K (91W) Review: The New Out-of-the-box Performance Champion