kostas65g :
Yes but that guide doesn't say what vcore should i use to be stable it just says 3.8/4.1 ghz
There is NO magic bullet when it comes to a "number" that works for everybody. Much like fingerprints, every single CPU, and to some extent, GPU and memory module, is an individual, with individual characteristics and properties that are not going to allow what is "normal" for one to be what is normal for another.
That is why I linked you to that overclocking tutorial. You MUST use prescribed steps to determine what YOUR cpu works best at and what it's limitations are. Even if five other chips all work well at a particular setting, it doesn't mean yours will. This is why buying a CPU is called the silicon lottery. Some win. Some lose. Some can achieve high overclocks using relatively low voltage, others cannot do so without a much higher voltage. Still others will not be able to achieve a equivalent overclock AT ALL, no matter what the settings.
In addition to what I linked you to before, this is a pretty go to standard across the board for both novice and weathered overclockers, so if you can't figure out the process you need to follow between these two tutorials, then you are simply looking for somebody to give you a cheat sheet that doesn't exist because the process needs to be followed in order to obtain a conclusion, or you simply are not trying, or are not capable, of comprehending the information contained in them.
Not everybody can or does. That is ok. In that case I would suggest that not overclocking is the best plan of action. I do not ever recommend using an overclocking desktop type utility with an automatic setting either. Those tend to use far higher voltages to ensure stability and rarely allow you to achieve the overclock your system is capable of, or else burns something out far sooner due to the increased voltage and heat. Thermal fatigue is what we call it.
Prime95 v26.6 is THE primarily accepted way to do the majority of baseline stability and thermal limit testing running the Small FFT option.
Prime95 Version 26.6 download
Further, you can find extensive information regarding the Intel CPU architectures and specifications at the following link which is a somewhat definitive guide on that subject. The information below is taken directly from conversations with Computronix who is also the author of the Intel temperature guide, found here:
The Intel temperature guide
For AMD systems, specifically Zen/Ryzen, this should offer similar albeit not nearly as detailed information on that architecture.
Ryzen overclocking guide
AMD FX and A series overclocking guide
This is probably about the most referred to overclocking guide around, and it's principles can be applied to a variety of generations and platforms.
The Ultimate Overclocking Guide