https://www.techradar.com/news/intel-core-i7-9700k-spotted-overclocking-past-55ghz-across-all-eight-cores

Intel Coffee Lake Refresh processors are still a ways off from their rumored October release, but apparently users are already overclocking engineering samples, according to this latest leak.

The Intel Core i7-9700K was purportedly spotted overclocking at 5.5537GHz across all eight cores by ZOL. The Intel Core i7-9700K is thus far rumored to be an 8-core and 8-thread part, which normally operates between 3.6GHz to 4.6GHz, and boosts up to 4.9GHz with single-core Turbo Boost 3 – so this supposed overclock frequency is well above the norm.