I got a reply from intel-- Here is what they say about the temps.-----------------------------Agent Comments:
Hello,
I understand that you are concerned about the fact that there is a
difference of 15 degrees Celsius between cores.
This difference it totally normal and expected, actually you can see
differences of 20 degrees Celsius between cores.
This is because some cores are more used than others, even if the system
is in idle mode.
Usually the operating system uses more one core than the others, please
do not worry about the cores temperature difference, just pay attention
to the CPU temperature itself.
As long as the CPU temperature does not reach above 73 degrees Celsius,
the processor will be running under thermal specifications. Usually the
cores temperature is higher than the CPU temperature, so check the CPU
temperature not the cores temperature.
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My point about the higher temps in the 1st 3 cores compared to the 4th core is that if the temps were as cool the 4th core,I might be able to get a higher clock without worrying about the temps reaching 100c.