Gizmodo: Someone Managed to Overclock a 14-Year-Old Intel Processor to 8.36 GHz.
[1]https://gizmodo.com/someone-managed-to-overlock-a-14-year-old-intel-process-1
845862632

   Jim Bell's comment:.    "Liquid nitrogen and 97 volts VDD...)

References

   1. https://gizmodo.com/someone-managed-to-overlock-a-14-year-old-intel-process-1845862632