Just check this out from OCLab.ru!
A Core i7-7700K sample tested by professional overclocker Allen “Splave” Golibersuch was able to breach the 7 GHz barrier. To achieve this feat however, HyperThreading was disabled, and two of the four CPU cores were also disabled.
Paired with an ASRock Z170 OC Formula motherboard, the i7-7700K was bench-stable at 7022.96 MHz, at the chip’s maximum base clock multiplier of 69x, and a base-clock of 101.78 MHz. The Vcore voltage was set at a scorching 2.00V. The chip crunched PiFast in 9.02 seconds, SuperPi 2M in 4 minutes 20.25 seconds, wPrime 32M in 2.953 seconds, and wPrime 1024M in 1 minute 33.171 seconds. Paired with an ASUS GeForce GTX 1080 STRIX OC graphics card, it scored 643,316 points in Aquamark, and 86,798 points in 3DMark 05.