Im not bragging about anything i just want the most out of this chip. Pointless buying a Z490 Board and a "K" CPU if you aint gonna overclock it of course its for a bit more performance is that to hard for you to understand?
This kind of response is unwarranted, and further, we simply don't allow it. Nobody is trying to be a-holish to you, these are valid questions and the REASONS for why a given person decides or chooses to overclock are often NOT the same as for everybody else. There are a variety of reasons why somebody might do it. Some do it for fun/hobby. Some do it because if you can get an extra 3% performance for free, or relatively free, then they choose to do so if they can do it in a way that doesn't require investing a stupid amount of money to do so. Others DO do it simply for bragging rights. Still others might be doing it for testing and investigative purposes, much like Computronix who authors the Intel temperature guide does, or those who are reviewers, or aspiring reviewers, looking to get their feet wet.
So, many reasons, and being asked what YOUR reason is, is no reason to have that kind of reaction.
Furthermore, there are also MANY reasons to purchase a K SKU processor and a Z board, even if you don't plan to overclock.
For one thing, the quality and extensive design of the VRM configurations on most Z boards, alone, is enough to justify buying one for many people as it's likely just doing that might offer some performance advantages over lower end chipset boards that can't maintain the stock boost and power levels as well as a mid grade or high end Z board can, even without any overclocking.
Plus, generally the Z boards have features, like additional M.2 slots, more SATA ports, additional USB ports, and so on, that might make even a lower end Z board appealing versus even some of the better boards using the lower end chipsets.
Looks might be another reason. Aesthetics might only be achievable if a certain look is desired by using a particular Z board as the color or design of others might not be desirable for a given build.
And again, certainly "these are my specs" bragging rights often play a role, especially for folks who sometimes have more money than common sense or understanding of what they actually need.
All that being said, this is why we generally recommend doing your homework, extensively, before buying parts for ANY build, whether there is an intention to overclock or not. And the bottom line is, overclocking is, if not dead, certainly on life support and being handed it's hat. Manufacturers have had a VERY hard time achieving generational gains the last few generations and in order to do so have basically had to resort to factory overclocking and tuning the boost profiles to the point where there is little to no headroom for further overclocking unless you have no intention of the parts having to last for any length of time, such as for competitive overclocking, reviews, research or when a given person intends to upgrade every generation so they have no need for it to be a daily driver that lasts a few years.
IMO, on the last two generations of i7 and i9, and the upcoming generation with performance and efficient core architecture, especially the upcoming architecture, overclocking is either pointless or not achievable without being extremely fortunate in getting a golden sample which is almost impossible these days because just for it to become an i9 it probably already HAD TO BE a golden sample just to make the grade, or something along those lines. Even the premiere delidding company, Silicon lottery, is calling it quits because there is simply little to be gained and almost no demand for it now due to there being little to gain.
Plus, going from 4.9Ghz to 5.1Ghz is only a 4% increase in performance, and it's unlikely you'll see that translate into ACTUAL performance gains in a lot of areas. You'd see more gains in most modern software and games by allowing more cores to maintain their stock boost for LONGER periods of time than for a few (Now very hot due to the frequency and voltage increases) cores to realize a 4% gain that in all probability might actually be taking your into throttle territory.
If you can actually get it within thermal tolerance AND stable, and 5.1Ghz, and validate it, then I'd back it back off to 5Ghz and call it a day at the end of it all just for a little stability insurance, a little less heat and probably a lot more longevity.