Nope that is not the Temperature.That is what they call Thermal Margin.
IF CoreTemp actually could read AMD temps correctly it would show it as Thermal Margin.
All newer AMD chips show Thermal Margin instead of Temperature.You have to use a program such as AMD Overdrive to correctly read them. http://www.amd.com/en-us/innovations/software-technologies/technologies-gaming/over-drive
Thermal Margin indicates how far the current operating temperature is below the maximum operating temperature of the processor.Your 6C is dangerously close the the Maximum Thermal Operating Temperature.Your Max is 90C so your temp was 84C.
90C - 6C = 84C very very Hot
90C - 25C = 65C Still pretty damn hot