Is it downclocking because temps are high is the real question.
Run your game in a window and have activity monitor open
Check the ghz of the cpu and see if it's what your cpu says it can do or if it's super low. Like if it's a 3.0ghz chip but running at 2.1ghz, yeah it's too hot and it's slowing itself down so it doesn't fry up
Now, if you don't want high temps because you're worried about the lifespan of the chip, ask yourself if you're going to be using this chip in 5 years. Probably not.
I say, ROAST EM. YOU PAID FOR 75C, USE THE 75C
Lol okay I'll have to check this later too. Thanks! ---