One core running hotter than the other three

I recently built an core i5 based system. It's not overclocked, running Win 7 and has been puttering along stably for about a week now. To see if cooling (using a ZALMAN CNPS7000C-ALCU cooler).

Here is my question: Using the little Utility 'Core Temp', it appears that core 0 through core 2 are generally at about 22-23C at idle temp. Yet, core 3 has an idle temp of 30-31C. The lowest temp for core 0-2 is 22C while the lowest temp on core 3 is 28C.

So far, I have not tested under continuous load, but at around 10% load all cores are in the low 40% with core 3 always running slightly hotter.

Is this something I should be worried about. I know the temperatures are so far extremely low, but I am simply wondering if this might mean that the cooler is not seated properly or that I put the paste unevenly onto the CPU. Any thoughts?

Usually core 1 will be highest....run OCCT to get a real idea of what's happening

http://www.ocbase.com/perestroika_en/

If you get thru 60 minutes of OCCT, next step is Prime 95 w/ small FFT's.

happens all the time dont worry about it

well your GPU is dumping heat into your case so if you cant exhaust it then yes it would raise your case temps and yes even your CPU temps...

run LinX Linpack and ATI tool at the same time