Use AMD's own OVERDRIVE software. It's the only accurate software for FX-chips. It will show the 'Thermal margin'.
The thermal margin is the temperature gap between the current temp and the temp limit. I believe the limit for the 8350 is 75c, after that it will shut down to protect it self, that unless you have the setting disabled in the BIOS.
If the thermal margin value on OVERDRIVE is showing for example, 20c, that means the temp is 75c-20c=55c.