My max temps running DCS are 60C on watercooling. 70 is fine for gaming, I would not like to run 70C 24/7 but its well within its thermal limits. You can load that 5.0 Ghz overclock for gaming or other applications that would benefit and go back to default when your done. Then you get a cool system and an overclock when required (also better for the planet unless your on Solar)
Just click on the overclocked profile and load it, when finished you can then reset. AFAIK the o/c will stay even after reboot unless you default it back in AI suite