Temp: CPU vs Core...

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mis3

Gawd
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Jul 4, 2000
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I learned that CPU temp is measured at the geometric center on the topside of the processor integrated heat spreader.

Depending on the load, the difference between this temp and the CPU core is typical 10-15c. So, when we talk about CPU temp, which one are we referring to?

I read somewhere that the max operating temp of a Q6600 is 71c. Is this the temp of the CPU or the CPU core?
 
Most people are talking about the temperature of the core (provided by programs like coretemp), which is read directly off the chip itself. The other temp, which I think is called Tcase by Intel, is not directly measurable unless you put a temp sensor on the top of the chip. The temp limiting temp of the Q6600 is 85C, I believe, which is the core temp at which the chip will shut down - has no relation to the Tcase or temp of the integrated heatspreader.

Did that make it more confusing?
 
I just recently made the move from s939 overclocking to C2D overclocking, and judging by what I'm seeing on this forum and others, when people talk temps they are talking about temps in relation to the individual coretemps as reported by CoreTemp. So that's what I've chosen to use for my "authoritative" source (since temps seem to report different in every program i've used so far)

I figure this is the safer way to go, and if people are talking about maxes and mins, you want to be in the right ballpark, to be safe.

For example, Everest 4.20 gives me an "overall" CPU temp of 20c, which I know is not correct because ambient is at least 21-22c, while coreTemp will tell me 34/33/31/31 (idle) and 66/66/61/61 (load)

Also, I've heard the Tjunction max temp on the q6600 G0 is 100c, and 85c on the B3... I'm not positive on that though, so don't take my word for it. From what I've read, it sounds like it's best to keep the G0's under 70-72C to be safe, and definetly shoot for under 75C.
 
According to the following link, the max operating temperature (Tjunction) of a Q6600-G0 is 71c.

http://processorfinder.intel.com/details.aspx?sSpec=SLACR

My PC:
P5E-WS, Q6600-G0, Freezer Pro 7, 2x2 GB OCZ2P8004GK, eVGA 8800 GTS-512MB, WD5000AAKS, Cosior-620W, Antec P182

I added a 4th 120mm Antec Tri-cool fan in the mid front chamber of the P182. All 4 fans are set to low.
CPU: OC: FSB=311 MHz, CPU=2.8GHz
VGA: No OC: GPU core bus=670MHz, Memory bus=972MHz

Idle
According to SpeedFan, CPU 1%, CPU=30, Core1 and Core2 = 39, Core3 and Core4 = 37. Fan=970 RPM

After running Prime95 for an hour for all 4 cores:
According to SpeedFan, CPU 100%, CPU=47-50, Core1 and Core2 = 58-63, Core3 and Core4 = 54-59. Fan=2250 RPM
 
coretemp reads my G0 Tjunction as 100c

DONT USE SPEEDFAN IF YOU USE A G0 AS ITS 15c TOO LOW!

use coretemp.
 
mis3 said:
According to the following link, the max operating temperature (Tjunction) of a Q6600-G0 is 71c.

http://processorfinder.intel.com/details.aspx?sSpec=SLACR

My PC:
P5E-WS, Q6600-G0, Freezer Pro 7, 2x2 GB OCZ2P8004GK, eVGA 8800 GTS-512MB, WD5000AAKS, Cosior-620W, Antec P182

I added a 4th 120mm Antec Tri-cool fan in the mid front chamber of the P182. All 4 fans are set to low.
CPU: OC: FSB=311 MHz, CPU=2.8GHz
VGA: No OC: GPU core bus=670MHz, Memory bus=972MHz

Idle
According to SpeedFan, CPU 1%, CPU=30, Core1 and Core2 = 39, Core3 and Core4 = 37. Fan=970 RPM

After running Prime95 for an hour for all 4 cores:
According to SpeedFan, CPU 100%, CPU=47-50, Core1 and Core2 = 58-63, Core3 and Core4 = 54-59. Fan=2250 RPM
Click to expand...

You are confusing Tcase (temp at center of heatspreader) with Tjunction (internal temp reported by the Digital Temp Sensor system embedded in the internal circuitry of the cpu). You need to read the Thermal and Mechanical Design Guildelines for your processor found on Intels site. The value given in the link you referenced is the Tcase value.
 
Yes, I mistyped tcase with tjunction.

The Thermal Specification in the Intel URL refers to tcase and for my CPU is 71c. My understanding is this is the CPU temp reported by SpeedFan. Am I right?
 
Speedfan, if it reads your CPU correctly and is a recent version should be giving you the internal DTS core temps. There is nothing that can give Tcase, you have to cut a grove in the the heat spreader and install a thermistor to do that.
 
In using a few readers, I get the following:
Speedfan 40C load
CoreTemp - 58C load
TAT - 40C load
Everest - 58C load

So CoreTemp is the most reliable for me. The rest measure ambient. All are useful in telling you the temp changes, but I like to use CoreTemp for actual cpu temps.
 
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