100 degrees centrigrade--isn't that REALLY hot? Yikes, lol... I've found the cheap sink/fan that comes with CPUs seem to work fine in terms of reliability and longevity but are very noisy (high-pitched whine). I have a Scythe Ninja plus (around USD35?), and that is a lot quieter by far but I had to use the (southbridge?) heatsink from an older board since that one was smaller and the new one got in the way. Another heat source besides the CPU is hard drives, esp. if you have a number of them. So I guess you have to pay attention to the heat if you run apps that tax the system and push it to its limits.