Whats a good upper limit for temperature on my CPU?
This really depends on your CPU. Some CPUs handle temperature extremes better than others, and some have built-in thermal protection. A good formula is to take whatever mondo detects for an upper limit and add 10 to it (most temperature sensor readings are given in degrees Celcius). If you know this is above your CPU’s tolerances, then use the known tolerances as your upper limit (and consider getting better cooling). For a detailed breakdown of CPUs and their known temperature limits, see the CPU list.
