Are my C2D temp sensors off?

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harmattan

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Jul 24, 2006
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I installed a new e6700 yesterday. Nv Monitor and Bios show my idle to be around 49c idle/62c load. Core Temp, Speed Fan, and TAT show both cores running at around 55c idle/67c load; Tjunction remains constant at 85c. I have an OC of 3250. I have also tested at 3460, and all was stable. I'm using a Scythe INF and have already tried cleaning and reseating twice with the same bad results.

I know these temps are way high since my e6600 ran at 41c idle/51c load. I was a bit worried at first, but tried the "finger test" and touched the bottom of my HSF. I is lukewarm, not even hot. Is it possible the temperature sensors are shot? Has anyone else experience inexplicably high temperatures on C2D like this?
 
I was getting the exact same temperature reading, only in my case I was running an E6400 at stock settings with a Zalman S9500. I've sent back the E6400 to the OEM for testing and/or replacement, and I also put a t-bar on my S9500 and discovered it isn't terribly flat, so I asked Zalman for a new heatsink as well.

I'll let you know which fix solves the problem.

-Bardia
 
I installed a new e6700 yesterday. Nv Monitor and Bios show my idle to be around 49c idle/62c load. Core Temp, Speed Fan, and TAT show both cores running at around 55c idle/67c load; Tjunction remains constant at 85c. I have an OC of 3250. I have also tested at 3460, and all was stable. I'm using a Scythe INF and have already tried cleaning and reseating twice with the same bad results.

I know these temps are way high since my e6600 ran at 41c idle/51c load.
Click to expand...

From the Core 2 Duo Temperature Guide:

Background

Some users also may not know that C2D's feature 3 temperature sensors; a single on-die Tcase sensor (between the cores), and dual Tjunction sensors (one within each core). Consequently, there is much confusion regarding specifications, calibration offsets and test methods, so results can be difficult to decipher and compare. Therefore, when expressing Idle & Load test results, it's also necessary to define the variables such as:

Tcase = Idle & Load
Tjunction = Idle & Load

Ambient = Room Temp
Chipset = Model
C2D = Model
CPU Cooler = Model
Frequency = CPU Clock
Load = Test Programs
Motherboard = Model
Vcore = CPU Voltage
Click to expand...

Core Temp's Tjunction 85c is not intended to change:

Troubleshooting

(H) Core Temp shows Tjunction 85c. This field is Intel's Tj max spec, is info only, and does not change.
Click to expand...

Your sensors are fine, you just have offsets.

Offsets

If temperatures don’t meet the Parameters, then SpeedFan 4.32 can be configured to correct for Tcase and Tjunction offsets. From the “Readings” tab, click on the “Configure” button, then click on the “Advanced” tab. Next, click on the “Chip” field directly under the tabs, then use SpeedFan’s “Help and HOW-TO” icon included in the installation Program Group. Under “Contents” click on “How to configure” then click on “How to set Advanced Options”. Read this entire section including “Other interesting options” and “Temperature x offset. When configured, SpeedFan will provide a means to display all 3 Tcase and Tjunction temperatures correctly. SpeedFan is also extremely useful for observing temperatures and voltages using the “Charts” tab, while thermal benchmarking with TAT.
Click to expand...

Check out the following Sticky for info regarding proper temps and offset corrections:

Core 2 Duo Temperature Guide

Hope this helps,

Comp 8)
 
Thanks for the responses. I've read through C2D temperature Guide in detail now. So, are you saying my sensors are functioning normally and temps may be lower in actuality, but Speedfan needs to be calibrated to display the temps correctly? Is there anything I do to calibrate the other temp readers correctly (Nv Monitor, CoreTemp)?

Here's some additional info:

Ambient temp: 22c
All stock e6700/no OC: 48c idle/57c load
Vcore: 1.32V (at stock and OC'd)

I know the HSF is not the issue because I had the same exact one on an OC'd e6600 with cool temps. Its plate is smooth and without bumps or abrasion.

I just ran the 100% load test in TAT and temps skyrocketed to 83c on both cores, but there were no signs of throttling or lockage. This, in addition to the fact that the base of the HSF is not even close to hot at load, leads me to believe that it's either a calibration issue or faulty sensors.
 
Tcase = 49c Idle & 62c Load
Tjunction = 55c Idle & 67c Load

Ambient = 22c
Chipset = Model
C2D = E6700
CPU Cooler = Scythe INF
Frequency = 3.25 Ghz
Load = TAT 100%
Motherboard = Model
Vcore = CPU Voltage

Here's one of your answers from the Guide:

Troubleshooting

(H) Core Temp shows Tjunction 85c. This field is Intel's Tj max spec, is info only, and does not change.
Click to expand...

I'm still missing 3 variables. Please provide complete information.

Comp 8)
 
Tcase = 49c Idle & 62c Load
Tjunction = 55c Idle & 67c Load

Ambient = 22c
Chipset = Nvidi 680i
C2D = E6700
CPU Cooler = Scythe INF
Frequency = 3.25 Ghz
Load = TAT 100%
Motherboard = Evga 680i
Vcore = 1.32V
 
It happens consistantly. I just ran TAT 100% again and both core jumped ">85c", but No shut down or lock up at these temps! I really think there something screwy going on with the sensors.
 
It just seems to gradually increase.

60% - 65c
65% - 67c
70% - 71c
75% - 73c
80% - 76c
85% - 79c
90% - 83c
95% - >85c

Thanks for the help btw :)
 
Thanks for the crunching.

In the meantime, I've replaced the e6700 with an e6600. Here are the temps I have gotten with this e6600 with the same hsf in the same model mobo (680i):

e6600 @ 2925mhz
Vcore - 1.32V
nV Monitor - 36c idle/44c load
Core temp - 45c idle/52 load

Same Scythe INF hsf, seated and pasted correctly. Same case with same cooling. Different mobo (still eVGA 680i). I'm now getting the following temps:

e6600 @ 2925mhz
Vcore - 1.32V
nV Monitor - 49c idle/56c load
Core temp - 55c idle/65c load

I'm almost certain now there's something going on with the way the mobo is reading the CPU sensors. Any other input on getting more accurate temps would be useful. This is the first time I'm seein something like this.
 
Sorry it took so long, and thanks for the update. With your efforts to eliminate the variables, this narrows it down somewhat. I'm wondering how the 6700 would show temps on your other board? Different boards can certainly involve BIOS, super I/O chips, and differences in thermal tables. The following is an item from the Troubleshooting section of the Guide:

(F) 6XX chipsets may misreport Tcase and / or Tjunction accuracy at upper or lower scale.

Before we consider your new 6700 as having faulty sensors or registers, have you flashed the BIOS? Also, is it only TAT which shows the anomalous temps, or is it seen on all softwares?

Comp 8)
 
That just what I was thinking about trying the 6700 in my other mobo. I'll give it a shot and report back. Grrr... was hoping to not have to change out the mobo :x

I tend to think the sensors on the 6700 are fine since they are reporting nearly the same high temps on this board as my 6600 which I know runs cool on the other board.

Nv Monitor, TAT, CoreTemp and Speedfan all show these high temps. I did flash my bios, but the temps were the same before the flash.

Thanks again
 
Nah, I'm too scared. If the temps I'm seeing are in fact correct (even though I doubt that they are), running all three of those tests would be murder for my C2D. On the other hand, I was running at >85c with TAT for a few minutes with no throttling or shutdown... Still I think it's best not to run a heavy load on this mobo until I can figure out what the accurate temps are.

Will replace the mobo after I get off today. Hopefully, that will do it and I can RMA the 680i with the bunk readings.
 
Yep, bunk readings on my new Evga 680i. I tried the e6700 with the same hsf and same OC in my other board and am getting these temps:

37c idle/45c load Nv Monitor
42c idle/51c load TAT

These 680i's are junk. I've been through 3 of them with various problems on 2 different systems. Not to mention the SATA and PS2 issues that are par for the course with this board.
 
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