The only instability overclocking introduces is when you don't test properly and then try to run when the system isn't really stable. If your system isnt stable then its set to high. The main disadvantage Overclocking does it it can prematurely wear out electrical components. If you're afraid of it no one is forcing you to do it. A k-series chip will run perfectly fine at stock settings. If you do wish to try overclocking then make sure to get a good cpu cooler and thermal paste along with the cpu.