Nvidia Geforce Gtx 660 Overclocking Problem

There is very little information about overclocking my video card.
If there are instructions, they are related to the general concept of overclocking this family, but apparently there is some kind of curse on mine.
When overclocked by Afterburner, after reaching the following values, it crashes after 5-15 minutes of playing Witcher 3.
Values: Core Clock - +25
Memory Clock - +220.
I can still drive the memory without crashes. 50 units, but once every 20 minutes it will stretch some texture, but I read that with extreme overclocking of one component, the other suffers.
I read that in the BIOS of the video card, you can remove some kind of overclocking limit, or something like that, and supposedly all the chips on the video cards are different, one is chasing, and the other is not the same.
Since I'm not an ace in this matter, I resort to your help, experts.