Celcius? That's too damn hot. 100 degrees Fahrenheit is about 40 degrees Celcius which isn't too hot. Your CPU shouldn't run at 70 degrees Celcius unless you wanna drastically shorten the life of your CPU or mess it up from overheating. Anything under 50 degrees Celcius should be alright, I might even go to 55 or 60 degrees, depending on what sort of processor you have. The lower the better, of course.
It shouldn't shut down, but it WILL damage and shorten the life of your CPU by running it at high temperatures. Your CPU will have no problem being maxed out as long as you keep the temperature down.