I am not bothering to use core temp readings any more, they are too inaccurate to be of any use.

Under idle I was getting 35/42, with fluctuations of 39/50 with no CPU usage.....

The CPU temp reads 52c orthos load, 35c idle, much more realistic temps.

I would suggest people forget about this fascination with core temp readings and just go with the CPU temp reading. Core temp is of zero use with this generation of CPU.