It very well could be that the CPU is not being cooled correctly. But take note that even at full load a CPU can handle up to ~85c. But if you are getting very high on idle. It's probably to do with the CPU cooler not being connected properly. Try to reseat your CPU cooler, I have the 3570k and on Idle I average 25c, without OC, with OC I idle on 35-40c. Hope this helps!