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i7 2600k uneven core temps

post #1 of 17
Thread Starter 
What's the proper way to apply thermal paste to Core i7 2600k?

I'm following the instruction on Artic Silver website, and applied a thin vertical line in the center of the CPU (with arrow at the bottom left corner).

My temp is around 23-28C idle on core 0 and 2, but 35-40 on core 1 and 3. I'm using Thermalright Venomous X on it, together with either AS5 or CF3 (comes with the Venomous X). I'm getting MUCH better temp with the CF3, probably because my tube of AS5 is too old, but that's another topic. The thing is, I'm getting this uneven temps with both AS5 and CF3, and I have reseated it half a dozen times already. But the paste did seem to spread pretty evenly when I remove the heatseak to see.

Anyone has any idea how the 4 cores are located on the 2600k? Roughly speaking, core 0 and 2 are getting the same temp. While core 3 is about 5C higher, and core 1 is another 5C higher (i.e. roughtly 10C higher than core 0 and 2).
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post #2 of 17
Well these are idle temps, we're not really concerned with them, they can have stuck sensors which can't be fixed.

What are you on load temps when you run prime95?

Comps
post #3 of 17
Same thing happening to my 2500k too. There is 1 core that is always 5-6°C hotter than the others.Maybe this is Normal.
    
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post #4 of 17
if the same cores are hotter after reseating the hsf, then they most likely have bad/uncalabrated sensors
post #5 of 17
There you have it: core temp variation is normal; also, sensors vary - they are not bad but are tiny little things, accurate only when close to the shutoff temp, and we must expect variation.

So: intrinsic variation + sensor variation = variation reported temps.
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alpha updated
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post #6 of 17
The HSF and CPU may not be making good conact. I would try finger spreading a thin layer then see what pattern it leaves on the HSF. If its good then we can say its probably a sensor issue.
post #7 of 17
Thread Starter 
After running Prime95 for an hour (and still running) @ 4.5Ghz Vcore 1.29V, temps are

Core 0 - 53
Core 1 - 66
Core 2 - 60
Core 3 - 65

Yup... the variations in core 1-3 seem to be closer now, but somehow core 0 temp is still consistently 10+C below the other cores.
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post #8 of 17
Thread Starter 
Quote:
Originally Posted by Magikherbs View Post
The HSF and CPU may not be making good conact. I would try finger spreading a thin layer then see what pattern it leaves on the HSF. If its good then we can say its probably a sensor issue.
Perhaps... but I'm too tired of resitting the HSF again now. I guess I'll leave it this way for now.
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post #9 of 17
One of my cores is always about 10c hotter then the other 3.
It's TURBO TIME!
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It's TURBO TIME!
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post #10 of 17
Quote:
Originally Posted by khtse View Post
Perhaps... but I'm too tired of resitting the HSF again now. I guess I'll leave it this way for now.
With one core 10c less hot, you have complaints? I'd say it's

More seriously, I think you're looking at a sensor issue. Just move on.
alpha updated
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secundus
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CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
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Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
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Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
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alpha updated
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secundus
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CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
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