Question about CPU core temps.

[The Matrix]

When looking at the core temps on my CPU at idle ive always noticed that core #0 can be quite a few degrees higher then the other cores, sometimes core #0 can idle at 36 C where as core #2 can be at 27 C. Is their a reason for this ?

As a rough example thats a 7 degrees difference between core #0 and core #2.

 

[The Matrix]

Is the core0 temp much different to the other cores under load?

This was running prime for 30 mins.