[wellylug] cpu temperature reported incorrectly

[Peter Jones]

-----Original Message-----
From: Chris Hodgetts [mailto:chris at archnetnz.com]
Sent: Friday, 29 October 2004 1:19 p.m.
To: wellylug at lists.wellylug.org.nz
Subject: Re: [wellylug] cpu temperature reported incorrectly


I am not sure about CPU Temps.... but I know my harddrive gets fairly
warm!!

jenna:/home/chris# hddtemp /dev/hda
/dev/hda: FUJITSU MHN2200AT: 42 C
jenna:/home/chris#


Is this a 10 or 20 gig Fujitsu? Does it have a Cirrus Logic controller? 
(The main IC on the drive board)

There was a huge rash (eg over 6 million worldwide) of Fujitsu HDD failures 
(I must have changed a hundred or more in Compaqs, under warranty), 
caused by this IC. I don't recall the exact details but my understanding 
is heat caused electrons to migrate to places where they shouldn't have 
within the IC. Compaqs instructions to aleviate the problem were to avoid 
having the drive powered on for extended periods 

http://h30066.www3.hp.com/hddr/overview.asp?c1=5&c2=8&cc=ca&lc=eng&action=L

Quote "Based on the information from Fujitsu, the issue may arise under
certain 
conditions, such as 24X7 operation, high heat and humidity and failure to
employ power save features"





On Thu, 2004-10-28 at 17:09 -0700, Brent Wood wrote:
> --- Gordon Paynter <lists at paynter.info> wrote:
> 
> > I have an Athlon XP, and I have overheating problems: I have a SFF
Shuttle 
> > (SK41G) I brought back from the states, which uses a funny
heat-extractor 
> > pipe, but which overheats if I leave the case on and run with a full CPU
load
> > for a few minutes. (My solution has been to leave the case off, I
believe the
> 
> Umm... I'd have to say that is unusual. The Shuttle heat pipe is one of
the
> best engineered cpu cooling systems I've come across - except for the
Creative
> Labs Slix, which copied the Shuttle. The only overheating I've ever had in
one
> was with either a flaky cpu or a badly assembled unit. (I know the cpu ran
too
> hot coz I pulled it & swapped with a conventional m/b & cpu, the cpu still
> stayed hot. The Shuttle box ran nice & cool with the other cpu.)
> 
> Is the copper shim installed correctly between the cpu & heat sink? I've
had to
> fix a couple where the person (supposedly a professional) didn't bother to
> install it so the cpu's ran too hot.
> 
> 
> Does the fan speed up before shutting down? How do you know it is a cpu
temp
> induced shutdown? (does the over temp LED come on?)
> 
> Also note, as the Shuttle heat pipe vents the cpu heat directly outside
the
> case, with minimal internal heat dissipation, taking the cover off should
have
> close to zero effect on core cpu temperature. It will probably reduce the
> graphics card & power supply temperatures though.
> 
> In a PC case where the cpu heat is vented internally, with a conventional
cpu
> heatsink/fan, opening the case will often let the warm air escape more
readily,
> so opening the case will often cool all the components down. Quite
different in
> a Shuttle.
> 
> > 
> > correct solution is to remove the heat sink, reapply the thermal gell,
and 
> > re-seat the heat sink.) 
> 
> Worth doing if it will stop the cpu overheating. Doesn't take long, but a
bit
> fiddly in those little cases.
> 
> 
> Cheers
> 
>   Brent
> 
> 
-- 
Chris Hodgetts <chris at archnetnz.com>


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