Christ alive,
@Avengerpilot. I really have to tip my hat to all those who have stuck with you after all these different posts and threads about your 9590 and 990FX Extreme3. Next time, do some exhaustive research before putting together a PC and maybe you won't 1) buy a CPU that is wholly incompatible and possibly dangerous to operate with your board, even with throttling measures in place and 2) buy a board that would never make any "recommended" list for any price point.
Where is your motherboard manual? Why did you even think to start putting together your PC if you don't know how to locate multiplier and other basic CPU settings in the BIOS? Did you take a single look at the manual? Your board should have the old ~2013 style ASRock UEFI BIOS. It should be under OC Tweaker with all the other parameters related to CPU tweaking.
If you can't be bothered to refer to the manual, you could also do a google search, but no...also, please learn how to Edit your posts so that you don't end up posting two consecutive times for purposes that could be summed in a single post.
What you are referring to is probably AI Tweaker or some successor to it. It is Asus' name for an auto-OC utility in its BIOS. Half the time it brings Intel CPUs on stock coolers (for people who don't know better but still build PCs before they know better) to dangerously high temperatures and burns low quality or unheatsinked mosfets. It is an Asus feature, thus, you won't find it on ASRock; the closest thing for older ASRock boards such as my Z77 Extreme3 would be "Enhanced Turbo" or "Optimized CPU settings" but I'm not sure if your AMD board has this. Even if these auto-OC utilities exist, they would not help you because you need
lower voltage and multiplier, not higher.