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2500k 10c degree difference under load

post #1 of 13
Thread Starter 
Hey guys, like the title says, when my computer is under extreme load(IntelBurnTest), there's nearly a 10c degree difference between one core and the other three.

I built this computer last week, it's my first one, and this is really the only hiccup I've run into.

Case - HAF X
Processor - Intel Core i5 2500k
CPU Cooler - Noctua NH-D14

Overclocked to 4.5GHz @ 1.31v

Here's a pic to show you what I'm looking at:


As you can see, the first core maxed out at 63c, which if I'm correct, is about where I should be with the NH-D14 at this overclock, but the other three cores are 8-10c higher. Obviously, this bugs the hell out of me, did I just get a chip from a bad batch? I think that's the case, unfortunately But what do you guys think?

If it is from a bad batch, what would cause these degree differences?

Note: I've reapplied the thermal paste(Artic Silver 5) twice looking for improvements. I did get noticeable improvements with idle temps(40c idle down to 35-37c), but that first core still stays significantly cooler under heavy load.

That actually raises another question, are my idle temps okay, or should they be lower as well?

Any help is appreciated
post #2 of 13
I Get that on mine as well. But as my idle temps are all similar, i am not worried.
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post #3 of 13
its normal to have some difference between cores, ive seen worse than 10*C before. it might just be that one of your cores is a little stronger than the rest and therefore runs cooler.

your idle temps are fairly consistent so i wouldnt worry about it too much. it might be as simple as the other 3 cores are running other tasks while under the stress test (tasks like running the operating system, antivirus ext.) and this is causing them to work harder. the cooler core might be the free core in your system that while at idle runs nothing.
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post #4 of 13
I wouldnt worry mate they tend to vary abit
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post #5 of 13
I have a 8-9C difference between hottest and coolest core with Linpack.
post #6 of 13
Totally normal, nothing to worry about
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post #7 of 13
Normal, nothing to worry about, I get roughly the same.
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post #8 of 13
Did you evenly tighten each screw on the HS to evenly distribute the paste?
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post #9 of 13
Normal, you could reseat the CPU and re-apply the TIM to get the temps closer together.
 
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post #10 of 13
not normal , in my opinion .. others seem to think so

That sounds to me like a bad seat , paste didnt even out correctly .

My temps are 1-2c apart , even on 100% load .

i would reseat the heatsink and use better thermal compound , it can be tricky getting a good seat but you will get it if you keep trying .
Edited by Xristo - 10/18/11 at 2:28pm
    
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