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i7 2600K 2nd core runs 10C hotter ?

post #1 of 23
Thread Starter 
OK so I built a new machine and wanted to burn it in b4 any serious overclocking. In doing so I noticed that every cpu temp program I use shows the 2nd core 10C hotter than the other 3 under full load (prime 95)
Idle i'd expect one to be hotter as I assume the os and most app's not multi-threaded and using 1 core but this seems it can't be right.

I'm a total noob not having tried to overclock anything since the celeron days.

Using the built in profiles in my board this cpu hits 4.6 and will run prime for hours but I'm reluctant to go higher or even run overclocked until I know about this 1 core being hot.

On the off chance a heat pipe wasn't lining up with this core I even removed my A70 cleaned all, reinstalled having rotated it 90 degrees and the same core runs hot by the same amount.

ANY input would be greatly appreciated.
my i7 2600k
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my i7 2600k
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post #2 of 23
You'll need to reapply the thermal paste
Black Dragon
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post #3 of 23
Thread Starter 
But I've had the A70 off reapplied and reinstalled in a different orientation and get the same problem.... what are the odds of me managing to get a hot spot air too much TIM or whatever over the same core ?
my i7 2600k
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my i7 2600k
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post #4 of 23

It's possible that either the CPU or plate on the Corsair is not completely flat, thus causing that area to different from the others.

Grab a straightedge (or ruler) and a flash light and turn off some of your lights. Then put the put the light behind the straightedge and see if any light comes through. Do this to both the CPU and the plate on the Corsair.


Skip ahead to 2:30 to see a demonstration.
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post #5 of 23
Don't forget it also takes a lil bit of time for the paste to cure and set etc. Also, the way these sb chips work it can also be safe to say that even during idle, apps running could possibly be favoring the 2nd core. BUT, since 10c is quite a big difference, keep trying to work with your paste and cooling.
post #6 of 23
Everyone is forgetting that the integrated heat spreader is *soldered* to the core. The IHS is NOT the core!!! And it's not just "touching" the core either, othewise the heat transfer would be pretty bad.

In the old days (Pentium 4), the IHS was simply attached to the core with thermal material mating the two surfaces, and all you needed to do was take a razer blade and pry with a certain method at each corner, and proper technique (required study) would pop the IHS right off.

Starting with Core 2's, Intel started soldering the IHS to the core, meaning popping it off would rip off part of the core with it (some people found a way to melt the solder very carefully, but even THAT was risky, and rarely worked).

The problem is that the solder-IHS surface isn't always perfect, so you wind up getting variations in the core temps. Lapping can improve temps a few C, but will rarely make the cores all level.

For comparison, my third core is my coolest core (at idle) while my 4th core is the hottest (9C hotter than the third core), and the first core is second hottest. But at full load, the first core is the *coolest*, with the second, third and 4th cores being almost the same.

Have a look for yourself and see:



Here's it at idle so you can see the difference (lower speed tho: my 24/7 settings)

Edited by Falkentyne - 4/10/11 at 2:07am
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post #7 of 23
ya my 2500k give me 2 cores that are about 7-8c higher than the other 2. Even after reapplying thermal it was not much different.
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post #8 of 23
My third core is consistently 6-8 degrees hotter than the coolest core. I just figured it was normal and have never worried about it.
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post #9 of 23
Same here. Cores 3 and 4 are within 1c of each other. Core 2 is 4-5c cooler. Core 1 is 8-10c cooler. I don't really trust that any of these readings are correct because at idle they're all within 1c of each other. Reseating and reapplying TIM made no difference.
    
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post #10 of 23
You're not the only one. Same cooler, same CPU. I had it with my old 2600 aswell.

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