Still getting wierdly low C2D core temps

marcosscriven · 17 Oct 2007 at 15:01

Hi. This is what I am getting on my E6750 (using CoreTemp)

Idle with case fans on high: 10C
Idle with case fans on low: 15C

Fully loaded both cores, case fans on high: 32C
Fully loaded both cores, case fans on low: 37C

In all cases, my mobo reports a temp which is about 4C higher. So for instance now with my case fans on high, and CPU idle, I am getting 10C on coretemp, and 14C reported by the mobo.

My room thermometer says about 20C.

So whats going on? Can I take it that BOTH core thermal sesors, AND the mobo sensor are all duff?

divuk83 · 17 Oct 2007 at 15:15

Have you got the latest version of the bios for the board? Often a bios update cures weird temp readings.

Dave

cozm01 · 17 Oct 2007 at 15:24

Overclock it till it reaches over 65c, you should have good overclock! ok, I joke, but do you live Scotland, if so, temps are fine.

marcosscriven · 17 Oct 2007 at 15:32

Thanks for replies.

Dave - Yes, I have revision 14, which is the latest for my Abit IP35 Pro

cozm01 - No, I live in central london. BBC weather says outside is 15, so I doubt my CPU is below outside temperature!

I am worried about the temps, as I would like to overclock. But what if I overclock and get a reading of 50C and it turns out that actually its 90??

Overall, the fact that the mobo CPU temp and the coretemps at least go up and down together, and that they both seem to respond to changing the case fan speeds, it does at least mean that the relative temps might be right, if not the absolute.

IceShock · 17 Oct 2007 at 15:47

download core temp:

http://www.thecoolest.zerobrains.com/CoreTemp/

it will give you a 99.99% accurate reading of not the cpu in general, but the cores inside it

EDIT: Ahhh sorry, i missed the beginning saying your using core temp

Try downloading Intel TAT, that should allso be just as accurate

Iceshock

str · 17 Oct 2007 at 15:55

A C2D CPU has three temp sensors one for each digital core temp readings while the third provides an analog signal to the NB which is then translated by the motherboard into a digital value and is used as the motherboard reported CPU temp. Not all motherboards use the analog signal though but I suspect the IP35 Pro does.

Either you're using an old version of CoreTemp so temps are ~15c too low or it's likely your CPU's temp sensors are wronly callibrated or faulty resulting in the dodgy readings you're seeing. Yours is the first report of such issues I've seen so maybe you should report the problem to Intel and see what they say.

marcosscriven · 17 Oct 2007 at 15:58

Iceshock - just tried TAT, but running as admin I get an error saying

---------------------------
Intel® Thermal Analysis Tool
---------------------------
Error enumerating On Demand Clock Modulation support.

Terminating Tool.
---------------------------
OK
---------------------------

In any case, if coretemp is wrong, wont TAT be wrong too?

marcosscriven · 17 Oct 2007 at 16:02

str - Im using COre Temp 0.95 - I think thats the latest, unless I use the beta, which I assume is still in testing?

marcosscriven · 17 Oct 2007 at 16:05

oh wow! I just tried 0.95.4 beta, and guess what. I get totally different results.

Its now showing a much greater range, of between 28C to 32C on idle, with the case fans on high.

And the tjunction temp has jumped from 85 to 100, whatever that is anyway.

marcosscriven · 17 Oct 2007 at 16:11

Heres the logs, ran one right after the other, all idle:

0.95 results:
2720.00 11 11
2720.00 12 12
2720.00 12 12
2720.00 12 12
2720.00 13 13
2720.00 15 15
2720.00 16 17
2720.00 11 11
2720.00 11 11
2720.00 12 12

0.95.4b results:

2720.00 32 33
2720.00 30 30
2720.00 28 28
2720.00 28 28
2720.00 28 28
2720.00 30 30
2720.00 28 28
2720.00 30 30

marcosscriven · 17 Oct 2007 at 16:12

So... now it looks like I have believable temps, does only 8 to 10 degrees above room temp sound about right, for idling?

What would be a good load temp?

EDIT / Just re-ran Orthos. Seems to have peaked at 48C

So, overall:

Room Temp : 20C
CPU Core (Idle) : 30C
CPU Core (Load) : 48C

Does that sound right/ok for an E6750 at 2720 MHz with an Arctic Cooler Pro 7?

IceShock · 17 Oct 2007 at 16:17

marcosscriven said:
So... now it looks like I have believable temps, does only 8 to 10 degrees above room temp sound about right, for idling?

What would be a good load temp?

Yep, thats good for idle, for load anything up to 70c is fine, if its higher than 75c then you might want to sort your cooling

marcosscriven · 17 Oct 2007 at 16:23

ok, thanks. Im new to C2Ds (at least, in a desktop PC) and want to be sure I know the default temps before I start overclocking.

FYI, turned case fans down to low, and now I get a peak of 52C for load. Seems the case fan on high (and therefore quite noisy), make a considerable difference. (well, about 4C)