Help with Thermal Sensor

[RACERX88]

Guys,

I have and ABIT KA7 motherboard and an Athlon Classic processor. It has an "internal" temperature reading for the system and it is roughly 27 C. A thermal cable also came with the motherboard so I can read the CPU temperature. At First I taped this to the back of the CPU on the opposite side of the core. (The side where the AMD sticker is.) I was getting a temperature reading of about 35C. I then read in order to get a more accurate reading, you needed to put the sensor as close to the core as possible. One person suggested putting the sensor inside the CPU case between the heat plate and the core, in other words it is right on the core. Now I am getting temperature readings of around 52c? I have a VOS 32 heatsink and fans and two good system fans. I wanted to overclock this mother, but I am worried
about the temperature reading. Any advice? Should I just ignore the thermal sensor reading and use the internal temperature device to monitor the temperature?

Thanks,

Kerry

ABIT KA7
Classic Athlon 750 mhz
384 MB PC100 RAM
Gainward Ge Force Ti 450
Monstersound MX300
SuperHo Heatsink and Fans from 1coolpc.com(Globalwin VOS32)
IBM 9.2 GB Hard drive
300W Power Supply

[azhari]

NOOOOOOOOO.

You don't want to put the temp sensor between the HSF and the core. You want it between the HSF and the packaging, but touching the core. If you put it on top of the core then your HSF doesn't make good contact with the core and won't cool it down as efficiently as possible.

You are right about your temp thou. 52C is way too high. At the worst you should try to get full-load temps below 45C. Check out the HSF review on the main page to see how your HSF compares to others. Also see how your temps improve after you put the probe on the side of the core instead of on the top.

[RACERX88]

Well I removed the sensor from inside the CPU case. I shut down my computer for two hours and came back and as I started the minimum temperature was 40C. I knew it ws wrong so I removed and put it back on top of the CPU case where it mees the heat sink. I don't believe you can but a thermal sensor between the heatsink and a SLOT A core, but if I am wrong let me know. I just need to know the best position to put the thermal sensor on a SLOT A AMD Classic.

My heatsink and fan is highly rated and I have some good system fans right now also. The temperature right now is 26C, but I have the side panel off the case to my computer.

Does it sound like I have the sensor in the right place now?

Thanks,

Kerry

[XprincoX]

Hoot gave a very nice explanation of how to place your probes here: http://forums.overclockers.ws/vb/showthread.php?s=&threadid=55413

[RACERX88]

Man that means I will have to remove the CPU case and the heatplate just to install the sensor properly. I don't know if I want to do that? Any alternatives?

You havent't placred a temperature sensor on top of the CPU case have you? Maybe I could a few degrees C to Motherboard Monitor and would still have a fairly accurate reading?

By the way, I really appreciate your help!

Kerry

[RACERX88]

That is "add a few degrees to the Motherboard monitor."

Doh!

Kerry

[azhari]

Oh, I didn't realize you were talking about a Slot A cpu. What I said works for a socket cpu. To be honest, I don't know much about the slot packaging, so I will let someone with more experience handle this one. Sorry.

[RACERX88]

:)
Kerry

[Yodums]

I'll narrow it down for you.

This was basically taken from Hoot so the credit goes to him not me as he made a very good method to make the probe more efficent.

In the first picture I trimmed the tip of the sensor so that the thermistor is barely exposed.

http://forums.overclockers.ws/vb/attachment.php?s=&postid=422265

In the second step you trim back a little of the heatshrink on the leads where the sensor is attached to the zip cord. This insures that the probe is not so thick as to keep the HSF base from firmly contacting the CPU core.

http://forums.overclockers.ws/vb/attachment.php?s=&postid=422271

Lastly, nudge the sensor tip right up against the core edge and glue it there with a tiny dot of AS epoxy. Tape the remainder down against the ceramic substrate with a quality tape like Capton. If necessary shave off any AS epoxy protruding above the flat of the core. Now, you're all set.

http://forums.overclockers.ws/vb/attachment.php?s=&postid=422275

Gotta Love Hoot's explanations and diagrams they're very clear and very easy to understand.

Yodums

[stymee]

What Hoot and Yodums described worked great on my Slot 1 PIII (thanx guys). I think your Slot A is pretty similar. Just make sure there is nothing keeping the heat sink from sitting flat on the core, those clips on the Slot processors are not the strongest on the planet.

And that VOS32 should cool you down just fine, its one helluva brick.

[Yodums]

Originally posted by stymee
What Hoot and Yodums described worked great on my Slot 1 PIII (thanx guys). I think your Slot A is pretty similar. Just make sure there is nothing keeping the heat sink from sitting flat on the core, those clips on the Slot processors are not the strongest on the planet.

And that VOS32 should cool you down just fine, its one helluva brick.

Hey I noticed how all the rigs that you have in your sig you end up with the least power what gives! :)

[RACERX88]

Again I would have to pop open the CPU casing in order to properly connect the thermal sensor correct? (Slot A processor) I am going to have to do this in a few days so I can connect a GFD device so maybe it wouldn't be that big of a deal, but I really don't want to remove the heat plate on the CPU. Once I crack open the CPU case I wonder if it would give me an accurate reading if I placed the sensor on the back of the FSB directly behind the core?

Also where do I get AS epoxy and the quality Capton tape?

Thanks,

Kerry