[ale] k7s5a motherboard

[Dow Hurst]

You should feel that 13 degree difference if the heatsink was that warm, 
however, the CPU thermocouple is in the CPU not the heatsink so is 
misleading to interpret that temp as the heatsink temp.  The mass and 
temp difference between the CPU and the heatsink is considerable so your 
energy is dissipated by raising the temp of the heatsink by a small 
amount.   I haven't measured the current temp on the CPU of my Athlon 
XP1800 but will this evening.  I know my top temp on the CPU was 65 C 
and the the current temp with original heatsink was about 55-58C.  That 
was all BIOS based info.  I do know that AMD had on their site a PDF of 
how to build a case for proper airflow in their support section.  Since 
your BIOS is wanting to shut off the CPU at 45C you might need to see 
about upping that value instead of trying to cool the CPU more.  You 
might be at the normal running temp and the BIOS has too low a value for 
the shutdown temp.  I also looked for quiet PCs and suppliers of parts. 
 Got good info on fan dB numbers.  Anything under 32dB is considered 
very quiet.  One large quiet fan pulling air out of the case can it some 
instances be the best config.  A fan directly on top of the case instead 
of the back can be very good.  The Zalman fan has an adjustable RPM so 
you can get it down to 26dB.  Then a high quality low noise certified 
powersupply with the double fan input/exit format will pull the air out 
of the case vertically and push it out the back.  A fan pulling air into 
the case can overpressure the case and cause improper airflow patterns. 
 I'd love to study this more since Dell has optimized their fan/case 
design to create a incredibly silent computer with enough airflow to 
keep the CPU cool.

What is your CPU?

I have a video card fan, which was a loud fan for it's size, a chipset 
fan, a CPU fan, and two fans in the power supply.  Since I got a 300 
watt dual fan powersupply that wasn't low noise certified, it is the 
loudest fan noise coming from the case.  It is a better quality 
powersupply so isn't obnoxious.  The Zalman CPU fan is totally silent 
along with the chipset fan.  The video card fan died so I removed it and 
readjusted the Zalman fan to cover both the CPU and video card.  Works 
just fine.  I'll get you some numbers tonight.
Dow


Geoffrey wrote:

> Just out of curiosity, my expectation is that if the cpu is running 
> 45C (~112F), that the heat sink would be pretty warm to the touch, but 
> that does not appear to be the case.  Maybe not, since 112F isn't but 
> a few degrees above body temperature.  Maybe I've got my upper limit 
> wrong?? Input??
>

-- 
__________________________________________________________
Dow Hurst                  Office: 770-499-3428
Systems Support Specialist    Fax: 770-423-6744
1000 Chastain Rd., Bldg. 12
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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*Computational Chemistry is fun!*
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