Using Core temp i have one core thats 10oc hotter than the rest. Reseated the cpu HSF using arctic silver and it made no diff.
Is it anything to worry about?

It's normal, as long as it's stable you have nothing to worry about.

CPU's are mass manufactured on silicon wafers and quality throughout the wafer varies, so some run cooler than others.

If one core is doing more work than the others, because you're running an application that doesn't take advantage of multiple cores for example, you would expect it to be warmer than the others.

Is it still 10° hotter when under full load for some time? And what utilities are you using to stress test the cpu?

Is it still 10° hotter when under full load for some time? And what utilities are you using to stress test the cpu?

Thats right, even under load theres a difference. Im using Core Temp to view the temps. :)

If one core is doing more work than the others, because you're running an application that doesn't take advantage of multiple cores for example, you would expect it to be warmer than the others.

Thankyou. I didnt think of that:)

It's normal, as long as it's stable you have nothing to worry about.

CPU's are mass manufactured on silicon wafers and quality throughout the wafer varies, so some run cooler than others.

Thankyou :)

Google for Intel Burn Test.

The temperatures your chip will reach will upset you.