Temp difference between cores

Stiffex

Distinguished
Oct 24, 2008
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My cpu which is an E8400 shows a difference of 5 to 10 degrees between Core 0 & core 1.

Core 0 is running hotter even at full load & only occasionally levels out for a second or 2.

The difference is still evident using different boards and different heat sinks.

I have lapped the cpu and the heat sink and the discrepancy is exactly the same.

3 days ago i overclocked my cpu and core 0 shut down and showed a fatal error in Prime95.

Is this normal or do i have a faulty cpu ?

Is there any tools i can download that will test my cores and the genaral health and speed of my processor ?