Which CPU Temp to Trust??

[Mudokon]

e6400
asus p5b vanilla
Zalman 9500 AT HSF

2.1GHZ overclocked, so far, to 2.27GHZ

temperatures:
speedfan = 43C
core temp = 51C
Probe II = 53C

WHICH of these temperatures should i trust, i heard around here that ASUS has crappy readings, should i trust SPEEDFAN? or core temp?

also been running SPEEDPRIME2K4: after 5 min. core temp is reading 57C, speedfan reading 45C

opinions?

 

[Cheex]

Go here or here to get SiSoftware Sandra 2007 SP1.

1. Download & install it.
2. Open the program and go to the Hardware tab.
3. Double-click on Processors. It will gather the info.
4. In the list, look under Sensors. Your CPU Temperature will be listed in both C and F.
5. If you don't close the page, just refresh it as needed.

Note: If you are running a dual-core processor, you can check the cores individually by using the combo box at the top of the window.

This works for me and the temperature always corresponds with SpeedFan plus or minus 1 degree (most times they are equal though).

 

[Compellor]

I think Intel's own Thermal Analyzer is very good:

http://techreport.com/forums/viewtopic.php?t=43375

It seems more in line with Core Temp.

 

[phile]

Intel Thermal Analyzer displays exactly the same temps as CoreTemp, on my system. The discrepancy between what we're seeing with apps like CoreTemp and Intel Thermal Analyzer, compared to what the BIOS and speedfan read, is due to sensor placement. The BIOS is reading a sensor under the CPU socket, most likely, while CoreTemp reads from sensors on the CPU die, quite close to the core. Quite understandably, the core temps will be higher.

This is my understanding, anyway.

-phil

 

[Henny]

Intel's Conroe datasheet references Tcase when it comes to thermal specs.

Isn't core temp closer to Tjunction vs. Tcase?

I want the reading that comes closest to Tcase.

 

[Mudokon]

right now, after taking some excess thermal compound off, my CPU is running at 32C on speed fan, and 37C on core temp and 41C on probe II.

just wonder , all these programs are accessing the same cpu temp guage, why so off from each other?

 

[Mudokon]

i tried sisandra, it gave me 40C, same as what core temp was telling me.

i would REALLY like it, if speed fan was the accurate temp, since it barely climbs much with cpu stress tests

 

[eelw]

That Intel program is nice. Build in option to place each core under load. On my E6400, CoreTemp reads 1 degree higher than TAT.

 

[Mudokon]

how the heck are guys getting temps down to 30C, liars? what am i doing wrong, the only variable i see from getting my "idling at 43C" cpu to 30C idle, is getting a better airflow case, BUT , ive run the cpu with the case open, and the two case fans (on the window wall) directly pointed AT the cpu HSF , Zalman 9500 AT, and still startings up and hits 45C at idle.

what am i doing wrong?

no way going from 45 to 30C idle, is just a case issue

 

[ForgetCassettes]

I'm not sure what you are doing wrong if anything. I don't think every Core 2 Duo chip is going to operate at identical temperatures under identical conditions. It could be you were just unlucky and you got a chip that runs on the hot side. Speedfan reports my E6400 at 32C Idle and I'm overclocked to 3.2 GHz. I'm using a Lian Li PC-7B Plus Case with a Zalman CNPS9500 LED with Arctic Silver 5.
Screen Shot of Speedfan + CPU-Z

I would imagine there are guys running even cooler than I am.

 

[eelw]

Originally posted by: ForgetCassettes
Screen Shot of Speedfan + CPU-Z

You actually believe any of those readings that you're getting?????????

 

[Pantoot]

Originally posted by: ForgetCassettes
I'm not sure what you are doing wrong if anything. I don't think every Core 2 Duo chip is going to operate at identical temperatures under identical conditions. It could be you were just unlucky and you got a chip that runs on the hot side. Speedfan reports my E6400 at 32C Idle and I'm overclocked to 3.2 GHz. I'm using a Lian Li PC-7B Plus Case with a Zalman CNPS9500 LED with Arctic Silver 5.
Screen Shot of Speedfan + CPU-Z

I would imagine there are guys running even cooler than I am.

Well no wonder. You have fan #1 spinning at 85,000 RPM!

 

[ForgetCassettes]

Originally posted by: Pantoot


Well no wonder. You have fan #1 spinning at 85,000 RPM!

Haha I never noticed the fan speeds.
Someone asked me if I believed the readings and no I don't. I trust Core Temp which says I'm idling at 46C. The OP mentioned speedfan in his temperature readings and he said he didn't believe anyone could be in the 30's. I assumed he was referring to a temperature read by speedfan because I can't imagine someone running in the 30's according to Core Temp.

 

[Mudokon]

yeah, speedfan on my computer gives me the lowest temp reading.

core temp and probe II , highest

 

[phile]

CoreTemp and speedfan do not read from the same sensors, therefore comparing them is pointless. My experience with the P5W DH is in line with my past experiences. That is to say, all the apps that the reading from the mobo temp diode (everest, probe, speedfan, bios) are returning the exact same value, and all the apps that read from the core temp diodes (CoreTemp, Intel Thermal Analyzer, Everest) are returning the same values. So, if any temps are not accurate, I would tend to think it's not because of the software, but due to faulty sensors.

-phil

 

[Avalon]

Speedfan has multiple Temp readings. Sometimes the one it displays in the taskbar isn't your CPU reading. I had to check my BIOS hardware monitor to see which Temp matched up with my actual CPU temp in Speedfan. Once I did that, I found it was the most accurate out of other software programs I used. If you put much stock into software readers...

Realistically, I'd tend to believe your E6400 at such a mild overclock was idling at 43C, and not those higher numbers. It's a cool running chip. Asus boards tend to overexaggerate the temperatures.

 

[Mudokon]

yeah i see so many people in here with a e6400, asus p5b or deluxe, with a Zalman like me or Ninja, and they can overclock the cpu to 3.0ghz, i doubt that my cpu is running hot

 

[n7]

I'd say Core Temp is likely the most accurate.

 

[Mudokon]

ehehe, i wish speedfan was the most accurate....cuz its lower