As long as you keep it in the rated voltage range, no higher than 1.375v in your case, then the CPU should last a good 5+ years assuming it is kept cool and there are no power surges from a cheap power supply.
LinX will stress test much harder than OCCT or Prime95, it's free as well! Be sure to use the ALL button to test ALL AVAILABLE RAM, do not just set the ram at whatever you want, set it BELOW the Max Available RAM.
If your temps get above 65c then it's time you start lowering your OC &/or voltage mate, or go out and get a better cooler!!! SERIOUSLY!