<insert Mortal Kombat announcer voice>IMPRESSIVE!</voice>
With the help of LN2, Famed overclocker Splave pushed his Core i9-9900K to 6.9 GHz with a 1.7V Vcore. That's enough voltage to kill most conventionally-cooled processors, but cooling the processor to -190C gives the processor plenty of headroom. Splave told Tom's Hardware he has maintained a 7.1 GHz all-core overclock on some samples, and can reach up to 7.4GHz on a single core.