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Are these temperatures possible?

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27 Jul 2010
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Good afternoon,

I have an E8500 cpu, currently not overclocked. Every temperature monitoring program I can find reports essentially the same readings - one core idles around 37C, the other at 78C, see the screenshot below from CoreTemp.

I am using a Xigmatek s1283 cooler, so I am inclined to lean towards the 37C being the correct temperature. I have mounted the cooler with Arctic Silver 5 twice, just make sure it wasn't slightly loose or without good thermal paste.

Any suggestions as to why/how two cores can have such different temperatures? The only thing I can think of is there is a faulty thermometer proble?

4
 
you could try lapping your cpu and heatsink, its possible both are poorly finished and theres bad contact on one side, resulting in the increased temp on one core
 
It's unusual to have such a difference across two cores. I wonder if the Cooler is not secured properly and is hanging crooked for some reason. Try pushing the cooler top end toward the motherboard to see if the temps change at all.
 
my guess would be the cooler was installed incorrectly or the IHS wasn't put on correctly/doesn't fit properly

1st is easy to fix, 2nd would be a matter of returning the cpu
 
This is my third build so I know the cooler etc are fitted properly, I haven't seen this before. As mentioned I've re-mounted my cooler twice just to be sure.

Tealc, no temperature changes from pushing the top end of the cooler unfortunately.

Would it be worth installing a temperature sensor? Anyone have experience with that? I would like to overclock my cpu, but obviously that's out of the question if one core actually does idle at 78C..
 
Do the temperatures move when under stress, you may have a sensor which is faulty.

My E8600 had stuck sensors.
 
Does sound like stuck/faulty sensors, pretty common on the 45nm duals and quads, my q9550 had two stuck sensors.
 
Yeah I think the one sensor must be stuck. Just ran Prime95 for 25 minutes - the 37C core went up to 51C and the 79C core didn't budge.

If I do start overclocking would it be safe to therefore only take readings from the sensor that works and assume that the actual temperature of the other core is roughly the same?
 
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