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X5460 overheating ??

8K views 4 replies 2 participants last post by  Noxian 
#1 ·
Hello all,
I recently did a 775 Core2Quad ---> 771 Xeon (X5460 in my case) mod and everything works fine, I had no problems so far.
Then I checked the temperatures and... Idle temp. was between 50 and 60°C. During full load temps were between 75 and 80°C. !!!according to Core Temp and OCCT....AIDA64 and HWinfo both show under 60°C under full load
There it gets tricky:
1. I have a good cooler.
https://www.arctic.ac/eu_en/freezer-xtreme-rev-2.html and I attached an additional fan to it.


2. I used different software for monitoring CPU temps and I got very different results (picture below):


It only gets worse If I overclock.

I have a following question:
1.Which of the temp. monitoring software is right (i read somewhere not all programs show temp. correctly since there is a 771 socket CPU in a 775 socket motherboard)
.
.
.
And yes I installed my CPU cooler correctly and there is no problem with thermal grease.
Any help would be appreciated.
 
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#2 ·
Intel CPUs do not report temperature data directly. They only report how far away they are from the thermal throttling temperature. All software uses the same formula to try to convert this data into a temperature number.

Reported Temperature = TJ Max - Digital Temperature Sensor Reading

The problem is that Intel never released any accurate data for the maximum junction temperature (TJ Max) for their Core 2 based desktop processors. All programs are reading the same data from the same DTS sensor but if two programs do not agree on TJ Max, they will report 2 different temperatures.

Let's say the DTS sensor is reporting 25. If one program is assuming that TJ Max = 100 and another program is assuming that TJ Max = 85 then you will get:

Reported Temperature = 100 - 25 = 75°C
Reported Temperature = 85 - 25 = 60°C

Which one is right? No one knows. One reason that Intel never released any official spec for TJ Max is that the actual TJ Max value can vary from core to core on the same CPU and from chip to chip even if they have the exact same model number. The newer Core i based processors are generally rated to be accurate to +/- 5°C but many Core 2 processors were not even close to this accurate, especially when lightly loaded or idle.

Getting accurate temperatures is a pipe dream so don't waste your time trying to figure this out because there is no 100% accurate temperature. The only thing a person knows for sure is that in the above example, when the CPU gets approximately 25°C hotter, it will start to thermal throttle and slow down and that is a bad thing. These sensors were only designed to control thermal throttling and were never intended to be used for 100% accurate core temperature monitoring. If your CPU is not thermal throttling then it should be running at its full rated speed.

If you would like Core Temp to report the same as the other programs then you should be able to change TJ Max to 85°C within Core Temp. The reported temperature will look nicer but whether it is more accurate is debatable.

Make sure you applied your thermal paste correctly. Core 2 Quads consist internally of 2 separate Core 2 Duos placed side by side. A line of paste from side to side is usually better than a dot or a line of paste from top to bottom. Here is a pic of how the 4 cores are laid out.

yWQlXwg.jpg
 
#4 ·
Your CPU is not thermal throttling so no worries.

You could try reinstalling your cooler a few times, clean it up and reapply the thermal paste like I recommended. If you are confident that you installed your heatsink correctly then reinstalling it will likely be a waste of time and money. Sure it would be nice if it ran a few degrees cooler but this will not make it run any faster.

Try bumping it up to 3800 MHz (400 x 9.5). Most 45nm C0 stepping Core 2 Quads should be able to run reliably at this speed. Use an appropriate memory divider so your memory runs within spec.
 
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