i7-3770k speedfan readings

I overclocked to 4.5ghz, and the intelburn test passes.

However, in speedfan I am a bit confused on the temperatures it is showing me.

Specifically the CPU temp vs the Core 0 temp.

The cpu temp stays nice and low during stress test (47c), but the Core 0 temp jumps to 87c.

What's the difference in those two readings and am I running too hot?
 

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