Core Temp

I've been trying to decide just how much value that AMD's Core Temp monitor has. While splitting a video, I noticed that Process Explorer only showed ~15-17% processor usage and SpeedFan only showed a temperature rise of ~3 degrees over idle, but looking at the activity for Core Temp, shown in the screenshot, it would appear to disagree with the other monitors. I understand that one must average out the values, but looking at the history graph at the bottom, I don't understand how it could be averaged out so low.

The question therefore is, does Core Temp has any true value as a monitor?

Although accuracy is obviously a factor, what I'm considering is the fact that there appears to be such a big difference between what Core Temp says and what the other monitors say, and having cross-checked with other monitors, like Everest, Speccy, etc. SpeedFan is accurate as far as the CPU temp goes. I have not cross-checked Process Explorer in the same fashion, as far as CPU activity is concerned, but it seems in line with what SF is saying. The thing that seems to be out of step is Core Temp, assuming that those horizontal grid line = ~25% each. Even the temperature rise is not what I would expect with the amount of activity shown.