http://www.techradar.com/news/intels-18-core-processor-peaks-past-61ghz-with-liquid-nitrogen-cooling

Intel’s new monster Core i9 processors boasting 18-cores and 16-cores have just gone on sale, and Asus has set some blistering new records overclocking these CPUs with its ROG Rampage VI Apex motherboard.

Using the Core i9-7980XE 18-core processor (with a base clock of 2.6GHz, Turbo to 4.2GHz) cooled with liquid nitrogen to around -100°C, expert ROG overclocker ‘der8auer’ managed to push the chip to 6.104GHz across all 18 cores (at 1.55V).