72C is the recommended safe zone, Intel will warranty the chip if kept below that temp. It can reach 95c but it will throttle speed down before it shuts down around 95c. Now to answer your question, I baleave Intel states that the max temp is 72c on the CPU not cores. the cores can run hotter then the CPU over all temp. Again Im going by a forum post about an i5 2500k, should be the same really.