Sure if you have no idea about the bios, but the 7800x 3d performs way worse and consumes more watt at anything other than games. Horrible CPU unless you are building a PS5 replacement. Also in a mini ITX the 7800x 3d is absolutely useless since you are not pairing it with a 4090. Gaming performance will be similar to an i5 12400 that costs half....
I personally knows a lot and most things in my UEFI BIOS. I'm however talking about the normal gamers that just want to put a gaming computer together and play the games they have right away without fiddling with other things.
Sure, the 7800X3D loses to the 14900K in productivity programs, no one is denying that. But what you don't understand is that there are A LOT more gamers out there that will benefit a CPU like the 7800X3D way way more not just for the gaming performance alone, but for the price and the lesser heat it makes towards the other components over how few that actually benefits the extra power and heat a 14900K delivers for tasks that require that. Because in what way would a 14900K benefit a gamer over what a 7800X3D does when you look at the price alone on them?
You see what i'm trying to say here?
Yes, there are way more gamers that will benefit a more pure gaming CPU with lower power usages and lower heat delivery in what those are using their computers for in general over those few that use their computers for CPU heavy things that will need the power a 14900K delivers, but comes with some massive downsides that are not optimal without a HUGE CPU cooler and a computer case without a billion fans in it.
Most normal users use their computer for tasks outside of gaming that will never require a 14900K or even a 7800X3D to be super fast and optimized for their usage anyways. So the only thing a 7800X3D benefits peoples on, is the gaming performance and the 14900K benefits the few peoples that uses their computers for super CPU heavy tasks.
I came from an 'Intel Core i5-4690K' CPU on my earlier computer before I did build the new one now. And the time it takes to open most 'normal programs' isn't really that much faster on my 'Ryzen 7 7700' CPU over how it was on my old 'Intel Core i5-4690K' CPU. The difference is however MASSIVE when it comes to do more heavy tasks inside programs that the new AMD CPU just runs circles around the old Intel CPU I had.
So for just the casual users usages, even a dirt cheap 'Ryzen 5 5600' will perform as good and open programs as fast as a 14900K in those basic tasks.