What is the temperature of the chipset (the chip below the CPU) called in Speedfan/uguru?

I did the bolt mod and couldn't see if it was making proper contact with the chipset properly because of that pad (which I should have removed so I could see).

Also my PWM is always cold, like, 30-35c cold. I'm not too sure why some people are reporting 80+c? Never gets hot to the touch even when I max the voltage out on it. Unless the PWM isnt the thing to the left of the CPU?

Also what are other temps called in speedfan? I'm sure someone has checked all this out before !

Thankyou !!!