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Large Difference Between Core Temps

post #1 of 6
Thread Starter 
I know that quad cores can have large temperature differences because of how they are setup on the die. However, I'm seeing a 15 C difference between my coolest and hottest core. I'm running an i7 2600K on an Asus P8P67 Deluxe, with a Tuniq Tower 120 Extreme using Arctic MX-2. My case is an Antec P180B. I'm running all fans at their lowest, I prefer a quiet system over a high overclock.

The ambient temp of my room is about 21 C.

IDLE @ 1.6 GHz w/ 1.3v (set manually to 1.3 because BIOS doesn't seem to want to dynamically adjust vcore properly)

Core 0: 27 C
Core 1: 42 C
Core 2: 38 C
Core 3: 33 C

LOAD @ 4.4 GHz w/ 1.296v (Prime95x64 26.4 build 1)

Core 0: 58 C
Core 1: 68 C
Core 2: 67 C
Core 3: 64 C

I've reseated it twice now. The most recent time I was extremely careful with screwing the Tuniq down evenly with the mobo out of my case. I've applied the MX-2 in a vertical line that goes along with the CPU die. I'm not sure if the mobo socket is causing trouble with the Tuniq's mounting or the CPU is very concave or something. My previous CPU was a Q9550 (w/ the Tuniq) used with an Asus P5Q Pro Turbo. I usually only saw a 7 C to 9 C difference between the coolest and hottest cores.

I know that a 10 C variance is considered ok, especially under load. However, the 15 C (sometimes up to 20 C) difference between core 0 and 1 at idle makes me wonder if I can get an extra 5 C to 10 C lower at load if I can figure out what is causing the issue. Or maybe I have a faulty chip/sensors?
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post #2 of 6
I'm getting the same "problem", with the same cores, as well. My Core 0 and Core 3 are cool, while cores 1 and 2 are around 10-15c hotter. It may be a per-batch problem, what batch does your 2600K come from?
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post #3 of 6
Thread Starter 
My 2600K Batch# is L040B705

I should probably do some serious inspecting of my mounting to see if there are any issues. I'm just wanting to avoid tearing my system apart over and over to just have temps not change. I had to re-solder a wire that I snapped on a fan controller last time.

I also wonder if core 0 is the core next to the integrated GPU that is disabled if you are using a discrete GPU? That might explain why core 0 seems to run the coolest from my temps and many others I've seen.

intelcorei72600kdie.jpg

Oh yeah, I'm using HWMonitor 1.17.1 to read the temps. I checked them with Real Temp 3.67 and they were the same variance, just reporting 2-3 C lower overall.
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post #4 of 6
I'm on L038A660 (great overclocking batch, I got lucky). Well, no correlation there. And even if the integrated graphics are disabled, I don't see how that can cool down the Core 0.

And don't bother re-mounting your cooler, my core 0 hits around 63C on maximum on 4.6GHz, which is way too low for my cooler. A bad mount should make temperatures go UP, not down.
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post #5 of 6
Quote:
Originally Posted by NeoQuixotic;12181164 
I know that quad cores can have large temperature differences because of how they are setup on the die. However, I'm seeing a 15 C difference between my coolest and hottest core. I'm running an i7 2600K on an Asus P8P67 Deluxe, with a Tuniq Tower 120 Extreme using Arctic MX-2. My case is an Antec P180B. I'm running all fans at their lowest, I prefer a quiet system over a high overclock.

The ambient temp of my room is about 21 C.

IDLE @ 1.6 GHz w/ 1.3v (set manually to 1.3 because BIOS doesn't seem to want to dynamically adjust vcore properly)

Core 0: 27 C
Core 1: 42 C
Core 2: 38 C
Core 3: 33 C

LOAD @ 4.4 GHz w/ 1.296v (Prime95x64 26.4 build 1)

Core 0: 58 C
Core 1: 68 C
Core 2: 67 C
Core 3: 64 C

I've reseated it twice now. The most recent time I was extremely careful with screwing the Tuniq down evenly with the mobo out of my case. I've applied the MX-2 in a vertical line that goes along with the CPU die. I'm not sure if the mobo socket is causing trouble with the Tuniq's mounting or the CPU is very concave or something. My previous CPU was a Q9550 (w/ the Tuniq) used with an Asus P5Q Pro Turbo. I usually only saw a 7 C to 9 C difference between the coolest and hottest cores.

I know that a 10 C variance is considered ok, especially under load. However, the 15 C (sometimes up to 20 C) difference between core 0 and 1 at idle makes me wonder if I can get an extra 5 C to 10 C lower at load if I can figure out what is causing the issue. Or maybe I have a faulty chip/sensors?

I feel bad for you... It is strictly luck of the draw. I was complaining about a 5C difference on Cores 1 & 2 @ 100% load.
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Rusty Metal
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post #6 of 6
I have the same temp results as the Original Poster. Getting a 8-10C difference between Core0 and Core1.
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