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E8400 and CoreTemp

Tooks

Tooks

Tooks

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24 Oct 2005
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Is CoreTemp not working properly on Wolfdale CPU's?

Reason I ask is that my idle temp reported in CoreTemp 0.96.1 is 45/46, and under Orthos full load it is also 45/46? :confused:

CPU reported temp sitting in the Bios is 27c, with a room temp of 23c which seems feasible under water cooling.

Just wondered if this is the same for others with E8XXX CPU's?
 
I've tried everest now too, as per the suggestion above, and that just gives an Aux temp reading of 45c too. The CPU diode Temp option which is usually present isn't anymore with the E8400.

0.96.1 reports a Tj. Max of 105c. Is that wrong too?

Core Temp has now shifted up to 48/49c after a couple of hours Orthos at 3.73Ghz. I can't help but feel it should be higher though, even with watercooling.
 
Yeah, you're right, I'm sure somebody will come up with a fix or a workaround before too long!

Anyway, mine has been ticking away at 3.73Ghz since this afternoon, about the limit I think given my 800Mhz RAM, but I'm happy with that. Lets hope I haven't toasted it eh?! :)
 
Tom|Nbk said:
Lol. Just use Speedfan to get the bios readings at least you know those are accurate enough to get a rough idea.

Give or take 5c with the speedfan reading but its a lot more accurate than coretemp atm which seems to be over by 20c or so.
Click to expand...

Yep, Speedfan at the moment for me. Shows 28c Idle, and goes up to about 40c under load. It's a guide and gives me something to go on whilst I fiddle with the overclock etc. Cheers Tom. :)
 
After reading the thread that dagwood linked to, and then the thread over on extremsystems, I'm believing that Intel have problems with the thermal diodes on some of the 45nm CPU's.

I don't think any amount of bios updates will 'fix' it, and I think it's a CPU issue.

Whether this is a 'feature' that should work or not is open to debate, but the rumour is Intel are struggling to supply enough laptop versions of 45nm chips owing to production problems linked to thermal sensor issues, so it seems like it is something that should work properly at least for laptop applications.

There would appear to be something strange going on, as even some of those people who report core temp working normally are reporting very high temps. With a smaller process and lower voltage, that shouldn't be the case really?

Personally, I'm not too fussed, the readings from the bios are enough to go on, and probably as accurate as anything Coretemp is telling you with these 8*00 CPU's, but it would be nice if it worked!
 
I'm using Speedfan and going on the CPU socket temp. With my watercooling kit, all my core2 cpus have idled approx 7 to 10c above the ambient room temp (usually 21 to 25c), so I've used the configure/advanced options in speedfan to add that amount to what it's reporting.

Interestingly, Speedfan doesn't report any core temps on my motherboard/cpu combo, so to find out which one was the 'CPU', I just loaded the CPU with Super PI 32MB and watched to see which temp went up! The one that was being reported as CPU was at 45c, and didn't move, just the same as on coretemp.

As I say, not ideal, but good enough for me to use as a base to see what voltage and overclocks do to my temps.

EDIT: I've just installed Speedfan 4.34 Beta and now Core Temps are reported, but they're exactly the same as Coretemp, and don't move under load...
 
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I remain to be convinced! :)

It might be the cure for some problems, but I'm not sure how the bios can impact what temps are being reported by thermal resistors in the core of the CPU?

I can see how a bios upgrade might change the reported socket CPU temp, as that's calculated via an algorithm I believe, so they could change that.

But what makes me believe it's a CPU issue is that no bios updates with any of my Core2 CPU's (and I've had a few!) have ever changed what's reported by Coretemp and/or other software that reads the thermal resistors.

I hope I'm wrong, and that a bios update does fix things, but I'm not hopeful...

@ Deluxe1, was Coretemp 'broken' before the bios update?
 
Deluxe1 said:
Coretemp readings havent changed since my bios update,they still seem to be stuck on 45c whilst idle.

Speedfan and the rest have,i used to get 17c for my idle temps,i`m still not %100 sure what to believe tho concerning my temps.
Click to expand...

I see now.

At least you've got a 15c range of movement reported by Coretemp, mine is more like 6c. Reported idle temps are the same as yours though.

All the core reading software I've tried shows exactly the same, and TAT won't even run.

Looks like Speedfan for me then, although I think the bios temp is optimistic so I've reconfigured it to be on the high side.
 
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