@Coffee2222
To add...
I was curious, your model Obelisk 875-1040st comes in two versions with the same model number. One is followed with a CTO suffix. Neither one has specs that can be looked up (configure to order's don't). I'm not sure what that is about unless who ever entered the models into the system down at the HP office, got something screwed up.
I assume you meant yours came with an i9-9900K ?
I had an Omen 880 system earlier this year and the new Intelligent Overclocking feature would cause it to black screen. I had a devil of a time getting it back to normal, having to go into Safe Mode to reset it.
But I had no trouble doing a manual (Custom) overclock.
Unless you just have the need for enthusiast bragging rights, I would do as @Grzwacz suggested and not mess with it. Its really not going to be necessary for gaming, considering what a beast that CPU is already.
Just my personal opinion: I think putting that CPU in a MicroATX build is a crying shame. If I wanted to overclock a 9900K, I would want a bigger case with plenty of air flow and a dual fan radiator.
If you decide to manually overclock, just use the Core Multiplier slider and go in small (1 to 2) increments at a time. When you adjust it, you need to reboot the PC twice for the overclock to stick (same for when you set it back to default, otherwise it might reboot on its own when you least expect it). Then run the benchmark to see if its going to run stable at that speed.
Then keep your eye on the temps to see how hot it runs during a game.
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