Engadget writer Richard Lai wrote an article in which he details his experience to overclock a processor to 7GHz. Lai says he's a total newbie to this but with the help of some experienced overclockers at the G.SKILL + HWBOT Extreme Overclocking Workshop at Computex he quickly got a Core i7 7700K to a frequency in excess of 7GHz.
The main objective of the workshop was to push the CPU from its 4.2GHz base frequency all the way to 7GHz, and this required lowering the CPU's temperature to nitrogen's boiling point -- -195.8°C or -346°F -- in the first place. My instructor, HWBOT director Pieter-Jan Plaisier, started by running Cinebench in Windows to ensure the CPU's stability while I slowly poured liquid nitrogen into the pot. Once the pot reached just a little below -190°C, the liquid nitrogen stopped boiling frantically, and this was when I could actually start overclocking.