Temp Problem in E5400

[Avathar77]

So I got a second hand E5400 for my backup PC and replaced the age old P4 630. Installed a fresh win7 64bit and I think there is a problem.
The CPU temps in the 2 cores are fixed at 40 and 36 C, they would not move up or down.
I have run Prime95, OCCT 3DM06 still the temps are the same!
I have used Speed fan, core temp amd real temp to monitor the cpu temps but they all say the same thing!

My backup PC config

Intel E5400 (R0) of Titan Fenrir
Gigabyte GA P35C DS3R (F12 Bios)
XFX HD5770 XXX
2 gb OCZ DDR2 667Mhz
250 gb Hitachi HDD
650W generic PSU

Currently running on an open case with room temp of 17C
Have not even got to over clocking yet!
Any Ideas?

 

[MeatLoaf]

Well known problem with the Wolfdales mate they have stuck thermal sensors so dont report acurate temps.

I had the issue with both an E8400 and an E5300

 

[Avathar77]

Well known problem with the Wolfdales mate they have stuck thermal sensors so dont report acurate temps.

I had the issue with both an E8400 and an E5300

hmmm I was just about to re seat the HSF!
Did you OC the 2 wolfdales? how can you oc with out getting correct temp readings?

 

[MeatLoaf]

hmmm I was just about to re seat the HSF!
Did you OC the 2 wolfdales? how can you oc with out getting correct temp readings?

Yes i clocked both, i was lucky tho as only one of the sensors were stuck i was able to get an accurate ( i think ) reading from one of the cores.

 

[Avathar77]

thanx for the info, I just searched for that thermal sensor issue with wolfdales and I am glad it is not some thing I did.
Now thinking of returning this, but cant find a replacement.

 

[pastymuncher]

You don't need to return it. Run IBT or Linx and the temps should move when it gets above whatever they are stuck at. Every Intel 45nm cpu i have had has had stuck sensors. E5200 was stuck at 42 degrees on both cores, E6300 37/41 degrees, E8500 both at 45 degrees, Q9550 37/37/41/38 degrees. All of them read correctly once over the temps they were stuck at.

 

[Avathar77]

ahhh ok going to run IBT now, thanx
last night I ran P95 for 3.5 hours and the "CPU" temp sensor in the mobo never got higher than 37C at idle its 14C. Core1 and core2 are 40 and 36 constant.

 

[Avathar77]

You don't need to return it. Run IBT or Linx and the temps should move when it gets above whatever they are stuck at. Every Intel 45nm cpu i have had has had stuck sensors. E5200 was stuck at 42 degrees on both cores, E6300 37/41 degrees, E8500 both at 45 degrees, Q9550 37/37/41/38 degrees. All of them read correctly once over the temps they were stuck at.

Yep, you sir are correct!
Just ran IBT - only few runs and core1 and 2 moved past 40/36 mark, highst was 43C. So they are moving once above the "stuck" temp value!
One of the concerns I had was that because these sensors are "Stuck" PWM in the cpu fan would not initiate and cpu could get damaged if overclocked or overheated too high.
But since they are moving I have seen the fenrir's fan sped up when the core1 and core 2 values were past 40C.
It will be an annoyance, but I can live with it for now.
Thanx guys for your input!
/goes off to do some overclocking/