@darrenz
Ok... downvote me because there was some truth in my words? [Some folks think upvote/downvote is anonymous. It's not.]
Manual settings is very inefficient on Ryzen 3000, and the higher up the product stack one goes, the worse the tradeoff gets between single and multi thread performance.
The 3900X has a 4.6ghz single thread boost. If you manually set 4.2ghz, it can no longer boost to 4.6 when it wants to, but you won't see that in an application like Cinebench, because it loads ALL threads by default.
You have to go to Advanced Settings and run the single thread benchmark.
Plus, not everything takes advantage of the small bump in multi core you may have gained from doing so; some apps still rely on single thread, and throwing away 400mhz will hurt if you're trying to min-max.
These cpus have power and temperature limits and boost their multi core performance on their own if the headroom is there, much like Nvidia's 10, 16, and 20 series do.
Advertised single thread is not affected.
Most users will run into the boost temperature threshold at 80C, long before they hit the power limits; 80C is where the cpu will stop trying to boost on it's own regarding all active threads.
If the user gets a big enough cooling solution, then the power limit is the only restriction in the way.
So, instead of manual, just get a beefy cooler, and one can get good thermals without sacrificing anything; it'll still boost to the advertised single thread, and the difference in multi core will hardly be noticeable.
Like, 2-3 months ago, there was someone who overclocked their 3950X to 4.3ghz. That may sound impressive, until you look up the advertised single thread boost: 4.7ghz...
You can use either Ryzen Master, or Hwinfo. Try 'em both and see which you prefer more.
Now Asus has apparently been following AMD's guidelines for stock operation more closely than the other vendors, so you shouldn't be having too much trouble with thermals.
It's just been the usual rat race between them trying to one-up each other in performance, but the end user is the one that gets screwed over, because those tweaks to the default bios makes the chips run warmer than they already do.
If you are having any serious thermal issues - 85C and up - then it's most assuredly the chassis; it doesn't look like a strong contender for airflow. Hybrid coolers still need good air flow, just like any other cooler.
A)You've got a blower gpu, so I know that's not interfering, since it dumps all it's waste heat out the back, unlike the axial fan models that dump most of it inside the chassis.
B)The hybrid cooler should be running at 100% pump speed. Doesn't really do it any justice to run it lower than that. That means having to run loud fans - I have a Celsius S36 as well, so I know.
So, what you're going to have to do is unplug the fans from the cooler's controller and plug them to the motherboard instead - if it's short on available headers, then get a Y or W splitter.
That way, you can control the pump speed and the fans separately.
Hope this helps!