I've got an Athlon, and at first, It got to 80°C in about Half an hour, you need to get some sort of cooling system, as I haven't got much money, cause I'm a student, and too lazy to get a job! I just knicked a load of old fans out of old and knackered PSU's and shoved them in my PC, not the best way to do it but, meah. . . . managed to get the temp down to 40°C which at least stopped my computer crashing! But yes they do overheat easily, especially if you don't have a sufficient cooling system.
PSN/Xbox 360 ID - Ianwoollam