With the CPU temps, you need to be careful in how you loo at them. For instance in regard to the i5 3750 this would apply:
67C is the "package" maximum temperature (the CPU's metal lid)
105C is the "junction" maximum temperature (the CPU cores themselves)
The junction (core) temperature is the critical parameter that dictates how large the risk of burning out a chip is. While the CPU should survive operation at 105C, this is not recommended and is easily avoidable under most circumstances by using a HSF or other cooling solution appropriate for the sort of use the chip will be subjected to.