I recently installed a new PSU MOBO CPU and a 2nd GPU, and I'm concerned about my CPU's 2nd core temp. c0, c1, c3 all run idle around 30-33c however c2 runs 36-40c idle. I'm using the stock heat sink and fan and I couldn't find a similar problem online. Any information is much appreciated, thanks in advance.
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More aboutcore 3570k idle temps
That's OK. At idle there is only light work being done, usually single threaded. So one core will always be a tad warmer. Open Task Manager/Performance and watch which cores are working when idle.