Overclocking hardware features aren't exactly plentiful on the ASRock X299 PROFESSIONAL GAMING i9 XE. You've got the BIOS-function buttons on the rear panel (BIOS flashback and CMOS clear) that come in handy when overclocking for sure, but that's not all that is here. We also find power and reset buttons on the board's bottom-right edge, along with a dual-digit POST display, which means you will know exactly what's going on should a boot fail while pushing those overclocks. You also get a dual BIOS implementation that ensures you can recover from settings that might be just a bit too far, so you can easily push the limits of what your chosen parts have on offer for the best performance possible.
Along the lines of getting the most out of your ASRock X299 PROFESSIONAL GAMING i9 XE, make sure you update to BIOS 1.10, which includes the multicore enhancement option. This option pushes up the core speeds of your CPU without much fuss as you might otherwise find the default Turbo profiling a bit restrictive on performance. This BIOS does also have a bit better memory compatibility, so you can push up those memory speeds and lower overall latency by as much as possible.