How do I find that my cpu is stable at a particular clock rate

Overclocking is always a big risk for those who are not much into it. But I am trying to find out some way through which it would be easier for me to find that the cpu is stable at a particular clock rate. I am yet not able to find a option for this. I am using a few old tools that slowly increase the cpu frequency and at a point the pc just crashes. I am not able to find a stable rate where I must stop. I do not overclock manually. Because that is a kind of pro thing and can cause problem with the hardware. I use automated software mostly. There are no tools that can simply predict that at this point the system is going to crash.