Where to put a cpu thermal probe?

[ives]

Hi,

I currently have my cpu thermal probe taped onto my the ceramic surface of my cpu so that the probe itself just touches the edge of the core. However, the mobo cpu sensor, which is under the core, give a temp consistently 10C above what my thermal probe says. Which is likely to be right ? Also, should I move th probe so that it is under the core?

thanks
Ives

[turkster]

Well its difficult to say. When you fitted the CPU did you make sure the mobo's sensor would touch the underneath of the CPU and it should have abit of thermal grease on it to increase heat transfer.
I dont know what is the best way to put the sensor on top of the CPU but what youve described sounds OK as long as it doesnt obstruct the seating of the HSF. I should imagine the reason the mobo sensor is so much lower than your top sensor has something to do with the fact that the top sensor is in contact or very close to the HSF and is probably cooled a bit by it. The mobo sensor is on the sie of the chip that doesnt get cooled and is in an enclosed space so it probably would get quite hot.

My mobo CPU sensor is usually 5-7 deg C higher than my top CPU sensor but I have mounted the top CPU sensor actually on the heatsink/waterblock itself so it measures the temp of the block not the CPU.

[ives]

Hi,

did you make sure the mobo's sensor would touch the underneath of the CPU and it should have abit of thermal grease on it to increase heat transfer

No, I didn't do that , but I will check.

I should imagine the reason the mobo sensor is so much lower than your top sensor has something to do with the fact that the top sensor is in contact or very close to the HSF and is probably cooled a bit by it.

Actually it's the other way around. My CPU sensor (mounted on the edge of the cpu core) is lower than my mobo sensor (below the cpu core).

cheers
Ives

[turkster]

Actually it's the other way around. My CPU sensor (mounted on the edge of the cpu core) is lower than my mobo sensor (below the cpu core).

Sorry i meant the mobo sensor hotter than the other sensor.

Fiddling with the mobo sensor to give it better contact is only going to increase the temps on that sensor anyway.

[IBM]

Where to put a cpu thermal probe?

You really want me to tell you?

[malfunction]

You really want me to tell you?

Glad you said that first... Heh heh heh... You said probe... Heh heh heh...

Ives... Can't you get a diode temp? Have you tried motherboard monitor (google for MBM5) - these days is has a nice little wizard that usually picks up all of the sensors on your board (including the temp diode in your CPU). Socket readings (and separate sensors) can never be that accurate (and are often badly calibrated)

[ives]

Hi,
I do have MBM5 and it gives about the same temp readings as the mobo cpu sensor. In fact,I thought that MBM5 got it's temps from this sensor becasue the readings were so close together. Are you telling me that there is a temp sensor built into the CPU die that MBM5 picks up? I didn't ralise that.

Cheers
Ives