If the answer is yes, please can you clarify me that do CPUs have specific point beyond which if we OC the CPU the clock-speed of cores will loose stability even if temperature is in control??
If the answer is no, then what should we do to get stability while achieving higher clock speeds??
Stability is not only determined by temperature but also by the method you use to overclock in the first place.
Of course high temperatures can and do affect high overclock stability, and temperature can be a limiting factor as to how far you even get with your overclocking.
But you can have a high temperature and still remain stable, but that does not mean your CPU is not already internally throttling to protect itself from that type of idiotic overclocking.
That type of internal throttling is evident in the CPUs output performance, so in one post, Joe Bob brags about his so called high stable overclock,
in another post Joe Bob is completely baffled as to why his overclocked benchmark score is way lower than his stock score was?
Joe Bob comes to the conclusion that overclocking is bad, because Joe Bob is completely ignorant of the fact that his CPU has built in protection that he cannot do a thing about!
Your CPU has built in protection to protect itself against, automatic motherboard settings that may go outside of the CPUs design specifications, or the individuals overclocking.
How do you think they warranty most CPUs for 3 years, if they did not build in internal protection, it's kinda like a throttle governor on a school bus, but much more complicated.
Sometimes it literally amazes me the amount of overclockers that are completely clueless as to the actual design specifications of what they are overclocking.
This applies to Intel and AMD CPUs, both camps have built in protection, Intel is pretty much open in their information disclosure, where AMD is a little harder to acquire the information.
The overclocker is left with the options of either overclocking to a state of stability with zero CPU performance degradation that is allowed by the CPU cooling he or she is running, or get better cooling and go a little further.
I cannot speak for you but I do not want my CPU overclocked to yield worse performance than it did stock, if that's the case, why overclock at all?
FYI, My 3770K Ivy bridge CPU has been overclocked to 5ghz for over 2 years, with zero benchmark performance loss.
There is much more to your initial questions than you may realize, and in some ways they affect each other because it is not just a simple Yes or No.
How the overclock is achieved is very critical, and IMO, manual BIOS overclocking is the best way to accomplish it, but you have to learn how to do it.
Edit: Sometimes your overclock is directly affected by the memory speed you are running so it's best to know what your CPUs memory controller was actually designed to run and understand the higher the CPU overclock the more heat is produced from an overclocked memory controller.