AMD Athlon II X4 620 overclocking

Such is the system:
Motherboard - ASRock N68C-S UCC
Processor - AMD Athlon II X4 620 @2.6 Ghz
RAM - 4 Gb 1600 Mhz

In General, I clocked this CPU to 3.2 Ghz. Multiplier x13 bus 246.
After 10-15 minutes of the stress test in AIDA64, the maximum temperature of 66-67°C, nuclei 60°C. the thermal paste changed recently.
The critical temperature is 71°C. would Like to know whether it is dangerous this temperature for a given CPU.
And another question, the critical temperature specified for the cores or CPUs in General?