So I know heat has been discussed but I can't find a straight forward answer. What temp is the max I should let me rMBP get to? I've seen up to 104 C. I can easily keep it in the 50s with the fans maxxed. My understanding is that as the CPUs get thinner (can't think of correct phrasing. Its late.) it safer for them to be hotter. So how hot is ok? Also, what app tells me the CPU temps? I have several apps and none of their temps for CPU seem to match each other.