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Heat lockups from SYSTEM temp??!??!?!

T

troubledshooter

Senior member
About a ten days ago, it was a hot day--about 28 C. My system temp was 30 C. Processor temp was 46, same as always under full load. I was still in the process of making sure my sys was stable, running rc5 all the time. I got 3 heat crashes that day. Figured aww hell and stopped running rc5. Got another one. At that point I had to leave, so I shut down and came back later (cooler) in the day. No problems, system temp dropped to 25, processor temp stayed at 46.

This past week, 0 problems. No crashes. System temp somewhere between 22 and 28 all week, processor never gets above 46-47. 100% stable.

Today, another hot day. About the same as last time. I am no longer running rc5 (determined it to be stable after 72 hours straight of RC5 and other usage). Today I got about 6 random crashes. After the first 2, I clocked back to 750. I got 4 more. System temp was about 30 all day long till tonight. Now still @ 750, 0 crashes.

What could be in my system that bails on me everytime my sys temp gets to 30 C???? More importantly, how can I fix this without making my box sound like a garbage truck?

thanks all
 
well, the kt7 has a very inaccurate cpu temp sensor that is made in the form of a in cpu socket thermistor. Even if the bios compensate's for this, there are too many variables to consider this number accurate. In most cases, this thermistor is measuring air temp behind the cpu, which is no longer the hottest part of the chip.

Your CPU could potentially be running hotter than 46.



Mike
 
I understand this very well. I debated putting in a paragraph explaining my reasoning as to why this was NOT the cause, and decided it would be unecessary, but here it is:

I know that the temperature sensors provided on most via mobos are terribly inaccurate. I understand this. But it is irrelavent. It is the DIFFERENCE between stable temps and unstable temps that is important. My computer is 100% (to my testing patience, the 72 hours stated above) running at system temps of less than or equal to 28, and sustained CPU temps of 46-47. Today, my system temp was at 30 or so, and my CPU temp was registering 34-38. WAY under the 46 at which I can run stably. Even if this "38" is in fact closer to 45, it is not important, as I am still stable at "46" and the change is going to be the same amount.

So, that said, once again I ask--what on earth would be doing this to me?

(BTW those 34-38 temps of crashes are accurate per my theristor. Right after each crash I would enter bios and check up on the health meter or whatever it is called. That was the temp range. When testing my sys @ 950+ upon reboots I would see myself in the low 50s)

thanks again
 
Huh? Inaccurate? How do you figure? If you make sure the thermisistor is touching the bottom of the CPU, it should be plenty accurate.
 
Mine does touch, but that isn't the issue at hand! I want to know how on earth my SYSTEM temp is causing me heat crashes while my CPU temp is 8 degrees lower, and not under load, than it can handle!

thanks again all
(I'm VERY confused)
 
As I understand it, your lockups only occur when the system temps reach 30 or more, right? CPU temp doesn't appear to factor into the equation ...

48C CPU temp under load doesn't sound too bad, but it is a tad high.

30C sytem temp does sound high though. The KT7's system temp is read from a sensor located close to the south bridge. Sounds like your CPU cooling might be ok, but your case cooling needs improvement. How many, if any, case fans are you running?

If it helps, here's my current setup ...

Mid tower case (packed pretty full - 3 hard drives, tape backup, 300W PS)
2 case fans, one sucking in the bottom front, one assisting the PS fan blow out the top rear.
Vantec CPU cooler/60mm fan
ABIT's included fan on chipset

Temps are ...

CPU (TBird 800@900MHz) hovers around 30C idle, 38C loaded
System ranges from 23-25C
 
Thank you! I am speaking english then! (you understood)

As I said, this happens only on REAL hot days. My case temp is usually a couple degrees hotter than room. I have an extra fan blowing out, nothing coming in...on a hot day doesn't really seem like that would help tho...

I think i may try modding the PS fan to get more out of it and changing other fan to intake...really want to keep noise down tho.

Today is about as hot as yesterday. Temps now are:

System: 30
CPU: 34
(@750)

So far no crashes, but just powered on an hour ago.

thanks again
 
Sounds like you definatley have a cooling problem, but other than the cpu. Make sure your system is clean (compressed air) and that your case fans (don't forget the power supply) are clean and not dragging a ton of dust. An overheating powersupply (nobody ever cleans the power supply) 🙁 can cause some real quirkyness. You can find quite case fans, they just cost more.
 
Yep, it does sound like it's airflow that's the problem ... the typical 'ideal' configuration is to have a case fan sucking air into the front bottom of the case, and make sure the power supply fan is blowing air out of the top rear of the case. This way you get cool air flowing into the bottom of the case, over the PCI/AGP card slots, the CPU, then out the top. Could be one of the cards in your system is overheating (likely the video card). One case fan shouldn't add too much to the volume of the system ...
 
I was at first suspect of the vid card too...not really any way to check it though. Everything was warm-to-touch, nothing hot.

anyhow, I'll fiddle once I get the chance (and for now hope for cooler weather)

thanks
 
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