CPU Temp Wrong?

[[TC]»Elmo«]

For the record, Tcase and Tjmax are two different sensors.

Tcase is the temp at the external heat spreader. (The metal cap of the cpu)
Tjmax a.k.a. 'core temp' is the internal temperature of the silicon.

The core temp is usually higher (as is its designed maximum). You don't want to ever exceed either of them, although the core temp is more critical.

Some CPUs have 1 sensor per core (numbered 0,1,2,3 etc), 1 somewhere deep in the chip (often just called 'core') and 1 for the heat spreader/cap.

These different sensors are usually the cause of different readings, although it's not as clear cut as that.
Unfortunately, the sensors don't actually give a value in degrees. Each chip tends to use a different scale for the temps, so the software has to convert it into degrees somehow - some programs have more accurate conversions than others.
In theory, the BIOS should be an accurate source, but the CPU is probably running a different mode in BIOS vs windows so comparing the two isn't always that helpful.