When it comes to overclocking on X299 with the Core i9-7900X things are pretty easy, but you are going to want to make sure you have a few things set so you have all 10 cores running at your set overclock. ASRock’s BIOS is not that complicated at all and overclocking in it is very easy. First you are going to want to set your CPU Ratio to “All Core” and then All Core to the CPU ratio you are going for. What is nice is at the top it will give you your targets so you know what you are shooting for.
Next you want to make sure the BCLK is at 100 and you may want to adjust the voltage as well. With that save your settings and boot. If you system boots then you are good to go, but you are going to want to run a stability test to make sure your system is 100% stable. We are shooting for 4.6 GHz on all 10 cores, this seems to be where we hit our thermal limit with our current cooling.
Running AIDA64’s system stability test we do have a stable system, but our CPU temperature was quite hot at 96C. You are going to want to make sure you have adequate cooling if you plan to overclock any of Intel’s Core i9 chips.