CPU Temp difference between programs?

What's the ambient? I think HWmonitor is wrong since 20C is really low.

ambient is 21c

The Foxconn software is reading the CPU temperature off of the motherboard sensor and HWMonitor is reading your core temperatures. The core temperatures are the ones that are more important to watch. I'd use Core Temp instead of HWMonitor since it doesn't seem to have the wide variance of HWMonitor. I've set polling to 5 sec in both and ended up with a 5C difference under normal loading (30-50% core usage), kinda strange IMO. Core Temp also is in line with Everest, where HWMonitor is still off (2 outta 3 monitoring programs match, get rid of the one that is off).

EDIT: Actually, I think this will answer your question a lot better. Basically your TJMax is set incorrectly in HWMonitor so it is reporting the wrong temperature.

20 C seems normal to me.
My CPU idle temp is lower than the room temp outside the case. It usually idle @ 19-20 C and the ambient is around 22-23 C. But inside the case, the idle temp is around 30 C, it's much higher.
Oh yeah, I am using Air Cooling.
And I also use HWMonitor to check the temp.

It just has different TJMax temps.

Also, idle temps are never really accurate which is why they can seem sub ambient. Sensors are only good for reading load temps.