Disclaimer: Overclocking is never guaranteed, so the results may vary depending on certain conditions and various hardware configurations. I am not recommending overclocking if you do not know what are you doing. High voltages may damage hardware and it will not be covered by warranty.
Using the ASRock BIOS, we were able to overclock the Intel Core i7-8700K from the default speed of 3.7GHz to a acceptable 5.0GHz. To achieve this, we increased the multiplier to x50 and upped the voltage to 1.35v.
Full load temperatures hit a high of 100 degrees Celsius, which is not good. In fact, the actual temperature reading is limited to 100 degrees, the true figure could be beyond that. At this point, the CPU start to throttle, which can only mean one thing … the overall system performance will be negatively impacted.
If you plan to overclock up to and beyond 5.0GHz, I highly recommend you use a custom water loop with a large radiator.