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E8400 "core 1" will not go under 37 degrees

post #1 of 5
Thread Starter 
Hello guys. I just mounted my new cpu cooler, Noctua dh-d14, but somthing is wrong.
"core 1" as realtemp calls it, will not go under 37 degrees idle. "core 0" is fine, its on 27 degrees idle.
But when i'm running Prime95, both cores are riseing to stable 40 degrees. When i close Prime95, "Core 0" is going down to 27 degrees again, but "core 1" are stuck at 37 degrees.

I have remounted the cooler 4 times, and still same problem.

Whats wrong with my cpu E8400?
Btw, its totaly stock specs, no OC..
Best regards, Alexander
post #2 of 5
Some of those chips would have issues with stuck temp sensors, there's likely nothing you can do about that.
Only other thing would be to try another monitoring program and see if that makes a difference, another board too perhaps but that's just way to much effort for an older chip like that.
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Stugots III
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K @ 4.5GHz ASUS Maximus V Gene EVGA GTX 1060 SC 2x8GB G.Skill 2133MHz 
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by candy_van View Post

Some of those chips would have issues with stuck temp sensors, there's likely nothing you can do about that.
Only other thing would be to try another monitoring program and see if that makes a difference, another board too perhaps but that's just way to much effort for an older chip like that.

My BIOS tells me 37 degrees same as Realtemp, Coretemp, and Easytune6.

So i think it must be the sensor. But the problem came after i changed my cooler. I have used the stock cooler for like 4 years. No problem with sensors. I came yesterday, when i changed my cooler. Pretty wierd.
post #4 of 5
It's not weird if your new cooler is doing a better job cooling your CPU. You might not have ever noticed this problem before because the CPU was not getting cool enough.

Anyway, the temperature sensors Intel used on their 45nm Core 2 CPUs were crap. They were never intended to be used for accurate temperature monitoring at idle. These sensors are only to control thermal throttling and thermal shut down at approximately 100C and 125C. For that purpose, I am sure they work just fine or Intel would not have shipped that CPU.

The temperature sensor the bios reads is completely different than the core temperature sensors that RealTemp or Core Temp read data from. The bios sensor does not have the same sticking problems that the core temperature sensors have.
Edited by unclewebb - 5/16/13 at 3:22pm
post #5 of 5
Thread Starter 
Quote:
Originally Posted by unclewebb View Post

It's not weird if your new cooler is doing a better job cooling your CPU. You might not have ever noticed this problem before because the CPU was not getting cool enough.

Anyway, the temperature sensors Intel used on their 45nm Core 2 CPUs were crap. They were never intended to be used for accurate temperature monitoring at idle. These sensors are only to control thermal throttling and thermal shut down at approximately 100C and 125C. For that purpose, I am sure they work just fine or Intel would not have shipped that CPU.

The temperature sensor the bios reads is completely different than the core temperature sensors that RealTemp or Core Temp read data from. The bios sensor does not have the same sticking problems that the core temperature sensors have.

Okay.. thanks for the answer smile.gif
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