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TAT vs Speedfan

post #1 of 11
Thread Starter 
i know that TAT and Speedfan both read from different sensors.

both programs a showing a big difference between eachother.

TAT shows 51C idle (no OC) - CoreTemp Agrees with this.

Speedfan shows 31C idle (no OC) - Everest and Easytune agree with this.

is 20C difference between the sensors right?
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post #2 of 11
Probably not, SpeedFan is hit-and-miss

TAT is far-and-away more accurate. I posted a similar question:

http://www.overclock.net/intel-air-c...-pc-probe.html

I go with TAT - Better to err on the side of caution.
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post #3 of 11
TAT is showing your Core temperature, others showing IHS (Almost) temperature.
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post #4 of 11
wait, 51C with NO OC at all? that's even too hot for the stock cooler
For example my E6600 @ 3.2 runs at 40C idle, with the same cooler!

Are you sure you've applied the thermal paste correctly (not too much?) it should be a little drop the size of a lower case o in your signature.. at least that's what the people on this forum were telling me
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post #5 of 11
Quote:
Originally Posted by Radeon915
wait, 51C with NO OC at all? that's even too hot for the stock cooler
For example my E6600 @ 3.2 runs at 40C idle, with the same cooler!

Are you sure you've applied the thermal paste correctly (not too much?) it should be a little drop the size of a lower case o in your signature.. at least that's what the people on this forum were telling me
Ya, that is a little on the warm side.

tUDJ, what is the ambient temperature? I ask because my little house varys, therefore my system temps can be up to 9C more in the PM, sorta like this: am ambient = 21C / idle = 35-37 /// pm ambient = 29C / idle = 42-44C Both sets with a load (P95 x 2) is about 4-7C higher. These are averages of averages.
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post #6 of 11
Quote:
Originally Posted by tUDJ
i know that TAT and Speedfan both read from different sensors.

both programs a showing a big difference between eachother.

TAT shows 51C idle (no OC) - CoreTemp Agrees with this.

Speedfan shows 31C idle (no OC) - Everest and Easytune agree with this.

is 20C difference between the sensors right?
Yes.

As you know TAT reads from a sensor in the chip itself while Speedfan and others read from the mobo. Speed fan has always been off we just didnt know it because up until recently we did not have a way of reading the actual CPU temp.
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post #7 of 11
Quote:
Originally Posted by gonX
TAT is showing your Core temperature, others showing IHS (Almost) temperature.
No, it's not the IHS's temperature, becuase an IHS's temperature can't be that much lower than the core. It just doesn't make any sense, it's showing the motherboard temperature. Or poissibly even the NorthBridge.
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post #8 of 11
Quote:
Originally Posted by lightsource
No, it's not the IHS's temperature, becuase an IHS's temperature can't be that much lower than the core. It just doesn't make any sense, it's showing the motherboard temperature. Or poissibly even the NorthBridge.
Your right speedfan reads a sensor on the motherboard but the sensor is the same sensor that bios reads which is a befuudled attempt to approximate the CPU temp its just not accurate and never has been.

The speedfan CPU temps can easily deviate by 10c to 20c from TAT.
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post #9 of 11
This post relates to Intel Core 2 Duo Processors (Core Micro-Architecture).

The Intel Thermal Analysis Tool measures the temperature of the CPU Processor Main Core from inside of the component itself (using the onboard sensor).
Speedfan measures the temperature of the die socket itself. This temperature will always be lower than the CPU temperature unless in a rare case the thermal levels of the socket proceed that of the core due to poor thermal resistance and airflow.

The algorithm used to interface with the hardware sensor that Intel TAT uses is far more complex than that of Speedfan's algorithm and is therefore more accurate.
If a test was used to determine relative thermal levels detected by each sensor algorithm then TAT would be more accurate, as far as up to 25% more accurate I believe

TAT, unlike most sensors, has the ability to generate an approximate system core thermal recognition scan. Therefore determining the hottest part of the processor itself and outputting it to a visual display i.e. a monitor.
post #10 of 11
Hi, for clarity, i am tUDJ's Dad, he used to post in my profile, but now has his own (i booted him out ,lol) .

ennyway, we took the cpu back to the supplier (Scan.co.uk) and they tested it, (they have an extensive hardware testing facility). with very experienced staff.
the guy who dealt with us, tried to fry the cpu with several stress tests etc (in a test rig) and told us it is fine.
we asked him what he made of our shut off temp induced shutdown etc, and the fact that TAT reads higher than , say , speedfan.
his angle on it was that TAT "and other windows based utilities" arn't any good, just "use prime 95 or memtest 86".
we figured that maybe now the cpu was tested "off the board" , we might have a problem elsewhere in the rig.
so we came home to try again. on refitting the cpu, all seems okay, the temps are down, no shutdowns, TAT now reads lower than before, bios reads into a normal/acceptable range, stress testing went fine, all seems ok.

whatever the problem was, it may have been due to poor installation at first (my fault if that's the case).
so although we seem to be fixed, we still really don't know for sure wether to trust TAT or not.
i must add that TAT wrongly identifies this cpu, and i have been wary of it, becuase of that from the start (paranoid old man).

anybody got any ideas how to determine wether TAT is an honest utility ?
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