CoreTemp temp reading weirdness...Halp?

[adlep]

Here it is:
Have E7500 Wolfdale OC to 3.66 GHz
Antec 300 case.
5x120mm case fans
Cooler Master Hyper 212 Plus with 2 Nocua fans (pull, push config).

Here is the problem:
CoreTemp shows a great temperature difference between cores:
Core 0 = 42 C
Core 1 = 33 C

However, under full load testing in IBT 2.3 (6 rounds)
Core 0 = 58 C
Core 1 = 59 C

How come there is a difference between cores @ idle ?
Should I be concerned ?
Screenshot

It might be nothing, but it pisses me off. I love symmetry.

Cliffs:
CoreTemp shows off reading @ idle, but everything looks symmetrical under 100% load while running IBT test

 

[VirtualLarry]

In idle, the temp sensors show the greatest error. Under load, they should be more uniform. You don't have anything to worry about.

 

[WoodButcher]

To quote unclewebb at techpowerup,

the sensors used on the 45nm Core 2 Dual and Quad core processors can become saturated or can become stuck at lower temperatures.

Here is the relevent link.
http://www.techpowerup.com/realtemp/docs.php