Hello
My suggestion is "dont use any 3rd party software for determining the temerature of the processor as most of the third party softwares are programed in such a way that they look at the process going on within the Windows task manager and whenever you run any game, or video which uses most of the processor's attention that software start showing you the temperature increasing which is fake" . so stick to the BIOS for correct information as these days some motherboard manufactures are using the convertors which use the thermodynamic sensors on the motherboars ( Thermistors ) which directly start passing the BIOS software the temperature of the CPU.
Moreover the 3rd party softwares are almost like spywares, so these softwares are not good from security point of view. You can go to start--> control panel- -> administrative tools --> open performance folder..... you will see lot of graphs and if you look closely it will tell you the meaning of each line in the graph. Good luck
Regards
Himanshu Dogra
MCSE