"Core Temp" - A program for accurate Rev F chips' temperature monitoring

turbotoaster · 6 Jul 2006 at 08:39

This is a new program that lets you monitor Intel's "Core", "Core 2" and all AMD K8 chips' die temperature. The temperature readings are very accurate as the data is collected from a Digital Thermal Sensor (or DTS) which is located in each individual processing core, near the hottest part.
The way this program works is as follows: Intel defines a certain Tjunction/TCaseMax temperature for the processor. In the case of Yonah it is 85C° or 100C°. First of all the program reads from an MSR, detects the Tjunction/TCaseMax temperature. A different MSR contains the temperature data, the data is represented as Delta in C° between current temperature and Tjunction/TCaseMax.
So the actual temperature is calculated like this 'Core Temp = Tjunction/TCaseMax - Delta'
The size of the data field is 7 bits. This means a Delta of 0 - 127C° can be reported in theory. But from preliminary tests, the reported temperature doesn't go below 0C°, no matter what kind of cooling was used.

For AMD the value the CPU reports is read and converted into an actual temperature. AMD chips can report temperatures between -49C and 206C

DOWNLOAD IT FROM HERE

http://www.thecoolest.zerobrains.com/forums/viewtopic.php?t=137

i have tried it on my dual core and it seems spot on, it gives me temps for both my cores, and i notice core 1 is higher than the other, which would explain why core 1 always fails prime first

can all he dual core people try this out and see what results it gives you

stigggeh · 6 Jul 2006 at 12:35

Hmmm nice find, i knew my shuttle reported temps lower than it should i just didnt know exactly how much

well it turns out i was right to do so, speedfan says 28c the program above says 40c

Clairvoyant · 6 Jul 2006 at 13:07

Speedfan is correct on 1 core the other is between 8-10c lower.

I wonder if IHS removal is required.

Gommsta · 6 Jul 2006 at 20:00

I've just tried this on my x2-4400 at 2.6GHz.

At idle Everest, speedfan, asus probe etc all give CPU temp as 38-39
With SnM my ull load the temp is reported as 49.

With this new program my idles are core 1 at 45 and core 2 at 36.
On full load core 1 is about 60 and core 2 45. Should there be such a large disparity? Also as soon as i unload the cores they drop straight back to their idle temps. Would the heat dissipate this quickly?

I'm not sure what numbers to believe.

stigggeh · 6 Jul 2006 at 22:03

just got my brother to run it on his opteron 165 .... 41c one core 42c on the other, not much difference in his case

turbotoaster · 7 Jul 2006 at 08:35

stigggeh said:
just got my brother to run it on his opteron 165 .... 41c one core 42c on the other, not much difference in his case

he must have good equal contact on his cores

Defcon5 · 7 Jul 2006 at 08:48

Why does this give different temps to other programs, surley they read the same sensor?

The Mad One · 7 Jul 2006 at 09:33

36'C 37'C for my opteron 170, 3'C lower then what MBM/SpeedFan reports

turbotoaster · 7 Jul 2006 at 09:45

this is the best program i have ever used

for people who are a having a weaker core, or what they belive to be weaker isnt so

i was getting 60c load on core 1 then 40c on core 2

if u run prime watch the core temps, slowly adjust the screws on you heatsink until the temps are close or the same, then u will notice your weak core will run a lot better.

it took me about 10 mins to adjust the heatsink, but its made a big difference. it must be picking the temps off each core, because adjusting the hs changes the temps

Clairvoyant · 7 Jul 2006 at 09:54

What HSF are you using to be able to adjust the screws.

What about those that have spring clips.

turbotoaster · 7 Jul 2006 at 09:57

im on water, u have to be unless u get a hsf with screw connection, i think a ninja is screw

roadie · 7 Jul 2006 at 13:33

If anyone wants more info on this programme, head over to this thread at Xtreme Systmes where the creator of it posts.

Gerard · 7 Jul 2006 at 21:52

Well if this is acurate speedfan must be a pos, speedfan reports 50c load for me @ 1.450 opty 1265 @ 2.8. This is reporting almost 67c on core 1 and 60c on core 0 :eek:

matt100 · 8 Jul 2006 at 08:55

Gerard said:
speedfan must be a pos

fair amount of truth in that statement, also speedfan makes its best guess at which sensor is which so it might be reading your chipset as your cpu or your ambient as your chipset etc etc.

Interesting, I've got 37 on 1 core and 50 on the next at idle!

Mind you my shuttle is in bits so the airflow is pants and the heatsink isn't fitted properly.

MagicUK · 8 Jul 2006 at 18:59

im on an opteron 146 at 280x10 at 1.376v according to cpu-z and this is reporting 53c or me, this is with a zalmans reserator, how hot is safe as the person i bought it off hit 3ghtz with this cpu, also ive been using GO SP2004 by johnny lee (thats why the cpu is at 53c) and would you reckon 24 hours and both still on green gos would indicate a stable system? ones runnings small ffts and ones running large ffts?

tia

Gerard · 8 Jul 2006 at 20:38

Thing i find weird is we've been having programs that can be upto 10c inaccurate in any direction, when all this time the cpu's have had something built into them which is probably 100% accurate seeing as its being taken from inside the core. Just find it mad that one of the motherboard companies never twigged onto this sooner and made a more accurate temperature program.

Tuvoc · 8 Jul 2006 at 21:12

My X2 3800 at 2.2 stock volts

speedfan - 53C
this program - both cores the same at 56-58C

meaz · 8 Jul 2006 at 21:15

3700+ @ 2.55GHz 1.35v / speedfan - 51c / core temp - 47c. Strange! it also says my processor is a toledo core but its only a single core 3700+.

3500+ @ 2.90GHz 1.60v / speedfan - 47c / core temp - 55c.

3000+ @ 2.25GHz 1.45v / speedfan - 37c / core temp - 39c

These temps were taken under full folding@home load.

turbotoaster · 9 Jul 2006 at 08:21

meaz said:
3700+ @ 2.55GHz 1.35v / speedfan - 51c / core temp - 47c. Strange! it also says my processor is a toledo core but its only a single core 3700+.

3500+ @ 2.90GHz 1.60v / speedfan - 47c / core temp - 55c.

3000+ @ 2.25GHz 1.45v / speedfan - 37c / core temp - 39c

These temps were taken under full folding@home load.

u sure its not a toledo, cause a lot of failed dual cores, bcame 3700s

Gaverick · 9 Jul 2006 at 11:22

My 4400+ X2 is 40c on both cores at idle, however speedfan and smartguardian report it as 33c, so a 7c difference for me. Under full load the temp is 50c on both cores reported as 38c in smartguardian and speedfan, so a 12c difference there.