Thank you to whoever started the CPU temperature thread, it jogged my memory into getting lm-sensors working on my AMD 64 machine
Once working I discovered this-
temp1: +41°C (high = +104°C, hyst = -26°C) sensor = thermistor temp2: +61.5°C (high = +80°C, hyst = +75°C) sensor = diode
The AMD64 is rated for a body temp not exceeding 70C so it looks like I need to take a look at the cooling on my own machine.
I am suspicious of the 41C case temp, the air coming out of the exhaust fan just doesn't feel that hot so I will have to look and see where the board thermistor is located and see if there is a hot spot.